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# Geometry and Measurement - PowerPoint PPT Presentation

Geometry and Measurement. What You Will Learn. To draw a line segment parallel to another line segment To draw a line segment perpendicular to another line segment To draw a line that divides a line segment in half and is perpendicular to it To divide an angle in half

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Geometry and Measurement

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## Geometry and Measurement

### What You Will Learn

• To draw a line segment parallel to another line segment

• To draw a line segment perpendicular to another line segment

• To draw a line that divides a line segment in half and is perpendicular to it

• To divide an angle in half

• To develop and use formulas to calculate the area of triangles and parallelograms.

• CHALLENGE

• Try to draw what the what you think the first 5 bullets may look like.

### What You Will Need

• Geometry Set

• Ruler

• Protractor

• Right Triangle

• Pencil

• Textbook

### Video Support

http://www.learnalberta.ca/content/mesg/html/math6web/index.html?page=lessons

Learn Alberta: Working with Angles

### Review

Line Segment: the part of a line between 2 end points.

Line: a line segment with no end points

### 3.1 Parallel and Perpendicular Line SegmentsStudent Outcome: I can perform geometric constructions.

• After this lesson you will be able to…

• Draw line segments that are parallel to each other

• Draw line segments

that are at right angles to

each other.

### What Are Line Segments?

• Parallel Line Segments

• Describes lines in the same plane that never cross, or intersect

• They are marked using arrows

• The perpendicular distance between

line segments must be the same at

each end of the segment.

• To create, use a ruler and a right triangle, or paper folding

Parallel sides

Parallel: two lines or two sides that are the same distance apart and never meet.

Arrows: show parallel sides

Vertex: the point where sides meet or intersect

Student Outcome: I will be able to describe different shapes

Learn Alberta

http://www.learnalberta.ca/content/memg/index.html?term=Division02/Parallel/index.html

Parallel: two lines or two sides that are the same distance apart and never meet.

Arrows: show parallel sides (where do the arrows go below)?

Vertex: the point when sides meet or intersect

Student Outcome: I will be able to describe different shapes

Learn Alberta - parallel

http://www.learnalberta.ca/content/memg/index.html?term=Division02/Parallel/index.html

### PAGE 84

• Let’s us draw parallel line segments

• Try to draw and check your drawings.

### What Are Line Segments?

• Perpendicular Line Segments

• Describes lines that intersect at right angles (90°)

• They are marked using a small square

• To create use a ruler and a protractor,

or paper folding.

Perpendicular: where a horizontal edge and vertical edge intersect to form a right angle

OR

when two sides of any shape intersect to make a right angle

Right Angle: 90’ symbol is a box in the corner

Vertical

Perpendicular side

Vertical side

Student Outcome: I will be able to describe different shapes

Perpendicular side

Horizontal

Learn Alberta - Perpendicular

http://www.learnalberta.ca/content/memg/index.html?term=Division02/Perpendicular/index.html

Perpendicular: where a horizontal edge and vertical edge intersect to form a right angle

OR

when two sides of any shape intersect to make a right angle

Right Angle: 90’ symbol is a box in the corner

How many perpendiculars do you see in each diagram

Student Outcome: I will be able to describe different shapes

Perpendicular: where a horizontal edge and vertical edge intersect to form a right angle

Right Angle: 90’ symbol is a box in the corner

How do you describe a perpendicular using points

Student Outcome: I will be able to describe different shapes

• What are 5 examples of parallel line segments in the real world?

• What are 5 examples or perpendicular line segments?

### PAGE 85

• Let’s us draw perpendicular line segments

• Try to draw and check your drawings.

### Practice

• Pg 87. #5

• What are the parallel and perpendicular line segments in the painting.

### Practice

• Pg 87. #5

• What are the parallel and perpendicular line segments in the painting.

• Segments CD, EF, and GH are parallel.

• AB is perpendicular to CD, EF, and GH.

### Practice

• Identify the parallel and perpendicular streets in the diagram.

### Practice

• Identify the parallel and perpendicular streets in the diagram.

Major Street and Centre

Street are parallel

Main Street and North Street

are parallel.

Major Street is perpendicular

to Main Street and North

Street.

Centre Street is perpendicular to Main Street and North Street.

• Page 87

Practice and Apply #7, 9, 10, 12, 13,

Extend #15, 16

### Airport Final Design(minimum requirements)

• Four Sets of Parallel lines.(Runways – 1cm wide, Taxi Lanes – 0.3cm wide)

• One perpendicular.

• One perpendicular bisector

• One angle bisector.

• One parallelogram.

• One triangle.

7. Buildings (Terminal, Maintenance, Control Tower)

8. Colored

9. Straight lines

10. Pencil

11. Creativity

Parallel and Perpendicular Line Segments

http://alokastudio.com/useit/2006/09/killer-runway-design/

Figure 1. Airport diagram of Boston’s Logan International Airport with Runway Intersection Lights, Takeoff Hold Lights, and Runway Entrance Lights (in red).

## 3.2Draw Perpendicular Bisectors

### Student Outcome: I will understand and be able to draw a perpendicular bisector.

• Use a ruler to draw a 6 cm line segment

• Label the endpoints A and B.

• Fold the piece of paper so that the points A and B lie on top of each other.

• Use a ruler to draw a line segment on the crease. Label this line segment CD. Label the point where the two line segments intersect P.

• Use a ruler to measure lengths AP and BP. What do you notice?

• Use a protractor to measure the 4 angles made by the intersecting line segments. What do you notice about these angles.

### Student Outcome: I will understand and be able to draw a perpendicular bisector.

• A Perpendicular Bisector:

• cuts a line segment in half and is at right angles (90°) to the line segment.

• If line segment AB is 2

20cm long where

is the perpendicular

bisector?

### Example

• Pg. 93, #9

• In some First Nations communities, fish are dried on a drying rack like the one shown. An extra support is needed for this drying rack to hold all the salmon that were caught. Use what you know about drawing perpendicular bisectors to explain how to do this. Include the lengths shown

in the picture in

### Solution

• Cut a support post that is 1.4 m long. To find the halfway point of the top horizontal pole, divide the length of 3 m in half to get 1.5 m. Place the support at this halfway point. Measure a right angle where the top pole and the support meet in order to position the support perpendicular to the top pole.

### Let’s Practice

Page 92

• #4- Trace the lines onto your paper. Use your protractor to measure the correct angles

• #6, 7, 8,

• Due Tomorrow for Homework!!

## Practical Quiz #1

On a piece of paper

Draw one set of parallel lines 7cm long

(on the front)

2. Draw a 8cm line segment with a 6cm perpendicular on it.

(on the back)

Virtual Protractor

Kidport – Measuring Angles

## 3.3 Drawing Angle Bisectors

### Student Outcome: I will understand and be able to draw an angle bisector.

• An angle bisector is a line that divides the angle evenly in terms of degrees.

<ABD = 45’

What is

<DAC =

D

45’

### Student Outcome: I will understand and be able to draw an angle bisector.

• To draw a line that divides a line segment in half and is perpendicular to it

• To divide an angle in half

### PAGE 95

• Let’s draw angle bisectors

• Try to draw and check your drawings.

• Page 98

Practice and Apply #6, 7, 8, 9, 12,

Extend #13,14, 15

## Review

How much fence will you need to enclose this baseball field?

Student Outcome: I will be able to understand perimeter.

## Review

Perimeter: the distancearound a shape

or

the sum of all the sides

Student Outcome: I will be able to understand perimeter.

## Review

How can you figure out these perimeters?

Student Outcome: I will be able to understand perimeter.

## Review

You need a tarp to cover this soccer field. How do you figure this out?

Student Outcome: I will be able to understand area.

## Review

Area: the amount of surface a shape covers

: it is 2-dimensional - length (l) and width (w)

: measured in square units (cm ²) or (m²)

Student Outcome I will be able to understand area.

## Review

46 cm

Figure the area for these objects?

50 cm

8 cm

Student Outcome: I will be able to understand area.

183 cm

6cm

100 cm

## Review

46 cm

Figure the perimeter for these objects?

50 cm

8 cm

Student Outcome: I will be able to understand perimeter.

183 cm

6cm

100 cm

Geo Boards for Proof

Student Outcome: I will be able to model area and perimeter

What are the perimeters for each rectangle?

What are the areas for each rectangle?

What do you notice?

Geo Boards for Proof

Student Outcome: I will be able to model area and perimeter

8 cm²

14cm²

18cm²

20cm²

What interpretations can you make based on the chart above?

The rectangles with the least width has the least area.

The rectangle closest in shape to a square has the greatest area.

Geo Boards for Proof

Student Outcome: I will be able to model area and perimeter

8 cm²

14cm²

18cm²

20cm²

What interpretations can you make based on the chart above?

The rectangles with the least width has the least area.

The rectangle closest in shape to a square has the greatest area.

Area and Perimeter Video ( Learn Alberta)

http://www.learnalberta.ca/content/me5l/html/math5.html?goLesson=12

## Practical Quiz #2

On a piece of paper

Draw a 60’ angle. Then bisect it.(on the front)

Draw a 8cm line segment with end points labeled A and B. Then draw the perpendicular bisector on it with an endpoint labeled C(on the back)

## 3.4 Area of Parallelogram

### PAGE 100Student Outcome: I will be able to solve the area of a parallelogram.

• Let’s build a parallelogram

• What is the relationship between base (b) and height (h)?

Area of a rectangle or square

Area = length x width

A = l x w

Area of a parallelogram

Area = base x height

A = b x h

• Page 105

• 3a.

• 3b.

### Let’s Practice

• Page 105

• 4a.

• 4b.

• Page 105

Practice and Apply #7, 9, 10, 12, 13, 14,

16, 17

Extend #19, 20

## 3.5 Area of Triangle

### PAGE 108Student Outcome: I will be able to solve the area of a triangle.

• Let’s build a triangle

• What is the relationship between base (b) height (h) and area?

Area of a triangle

Area = (base x height) ÷ 2

Area = (b x h) ÷ 2

### Let’s Practice

• Page 113

• 4a.5a.

• 4b.5b.

• Page 114

Practice and Apply #9, 10, 12, 14, 15,

Extend #16, 17, 19

## Practical Quiz #3

On a piece of paper

Draw a parallelogram with a height of 3cm and a base of 8cm. Solve the area.(on the front)

Draw a triangle with a base of 6cm and a height of 5cm. Solve the area.(on the back)

• CHAPTER REVIEW

• Page 116-117 #1-17

### Airport Final Design(minimum requirements)

• Four Sets of Parallel lines.(Runways – 1cm wide, Taxi Lanes – 0.3cm wide)

• One perpendicular.

• One perpendicular bisector

• One angle bisector.

• One parallelogram.

• One triangle.

7. Buildings (Terminal, Maintenance, Control Tower)

8. Colored

9. Straight lines

10. Pencil

11. Creativity

### LET’S BUILD

http://www.calfeedesign.com/framemeasurement.htm

http://mtobikes.com/mountain-bike-frame-geometry/