1-2 Points, Lines, &amp; Planes

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# 1-2 Points, Lines, & Planes - PowerPoint PPT Presentation

9/16. 1-2 Points, Lines, &amp; Planes. Objective: To understand basic terms of Geometry. Warm up:. You are about to see a video. Watch it closely and count the number of passes the white shirt teams make. Watch This Video Closely.

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## PowerPoint Slideshow about ' 1-2 Points, Lines, & Planes' - edolie

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9/16

### 1-2 Points, Lines, & Planes

Objective: To understand basic terms of Geometry

Warm up:

You are about to see a video. Watch it closely and count the number of passes the white shirt teams make.

Watch This Video Closely

Attention to detail will make the difference between a passing and a failing grade in this chapter.

Every minute detail will count.

So pay close attention to the details!!!

They will be in pink throughout the notes.

A Point

*Is like a location

*Is represented by a dot

*Is named with a capitalletter

*Has no size

When naming more than one you must use commas

*Is named by any two points on the line or by single lowercase letter.

Symbol is used over the

Top of the two letters.

A line

*Is a flat surface that has no thickness.

*Contains many lines & extends without end in all directions.

*Named by either a single capital letter (not a point) or by at least three points that are not on the same line.

Plane
Collinear

Point on the same line

If your asked if points are collinear and out of 100 points 99 of them are on a line and one of them is not, then it’s a non-collinear situation.

Coplanar

Point on the same plane

Problem 1

(A) What are two other ways to name

(b) What are two other ways to name plane P?

(c) What are the names of three collinear points? What are the names of four coplanar points?

A Segment
• Part of a line
• Consists of the endpoints and all points between them.
• Symbol is used over the two endpoint of the segment to name it.

Part of a line

• Consists of one endpoint and all points extending in one direction.
• Naming it: Endpoint as the first letter any other point on the ray as the second.
• Symbol is used over the top
A Ray
Opposite Rays
• Two rays with the same endpointsthat extends in opposite directions
• (always forms a line)
• Named by their shared endpoint & any other point on each ray.

Q

Are Explain.

S

R

Problem 2

What are the names of the segments?

What are the names of the rays?

Which of the rays in part (b) are opposite rays?

What are 2 other ways to name

What are 2 ways to name plane Q?

What are the names of 3 collinear pts?

What are the names of 4 coplanar pts?

2.

What are the names of the segments?

What are the names of the rays?

Which of the rays are opposite rays?

Homework

1-2 P. 16 #s 1-14, omit #3

### 1-2 Points, Line & Planes

Objective: To understand basic postulates (facts) of Geometry

Postulate or Axiom

Is an accepted statement of fact

We must never forget the facts of geometry because sometimes a diagram or a demonstration of a geometry topic may “look” to show one thing when in reality something completely different is happening.

Through any 2 points there is

• exactly 1 line
• If two distinct lines intersect,
• then they intersect in exactly
• 1 point.
• If two distinct planes intersect,
• then intersect in exactly one line
Postulates

Problem 3

Each surface of the box represents part of a plane.

What is the intersection of plane ADC and plane BFG?

(b) What are the names of two planes that intersect in

Postulates-Continued

• Through any three non-collinear points there is exactly one plane

Problem 4

(a.) What plane contains

Points N, P, and Q? Shade the

plane.

(b,) What plane contains

points J, M, and Q? Shad the

plane.

Problem 4

(c.) What plane contains

Points L, M, and N? Shade the

plane.

(b,) What is the name of a line that is coplanar with and ?

Which plane contains points, J, M, and L?

Which plane contains points L, P, and Q?