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## PowerPoint Slideshow about ' Polygons' - tal

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### 2-Dimensional ShapesIt’s all in the name

Polygons

- A polygon is a closed figure made of line segments, or sides. Each line segment meets at its endpoint with the next line segment.
- Basically, if the figure you see has straight sides that are all connected than it is a polygon.
- A circle is NOT a polygon!

You can tell how many sides a polygon has by looking at the beginning part of the name of the shape:

For example,

Triangle: The beginning part of this word is TRI meaning 3 so a triangle has 3 sides.

Let’s Look At Some Others

- Pentagon: PENT = 5 so a pentagon has 5 sides
- Hexagon: HEX = 6 so a hexagon has 6 sides
- Heptagon: HEPT = 7 so a heptagon has 7 sides
- Octagon = OCT = 8 so an Octagon has 8 sides

Quadrilaterals

- Squares and Rectangles are from a polygon group called QUADRILATERALS (QUAD means 4 so all quadrilaterals have 4 sides)

Parallelogram

Rhombus

Trapezoid

Square

Rectangle

Squares and Rectangles

Squares

Rectangles

A square has 4 sides that are EQUAL in length.

Every square IS a rectangle

All squares have four square corners

A rectangle has 4 sides in which the 2 opposite sides are equal in length.

A rectangle is a parallelogram with four square corners

Brainpop

- Here is a fun and interesting brainpop to help us review what we learned:
- http://www.brainpopjr.com/math/geometry/planeshapes/

PROBABILITY

Probability is the chance that something will happen - how likely it is that some event will happen.

In Terms of Probability

- Impossible : the outcome has no chance of happening
- Unlikely: The outcome has a very small chance of happening but most likely will not happen
- Maybe: The outcome has an equal chance of happening or not happening
- Likely: The outcome has a good chance of happening but may not happen
- Certain: The outcome will happen.
- Equally likely/unlikely: When comparing two outcomes the chances that both will happen or not happen is the same

Let’s Test Our ChancesWhat are the chances that the following events will occur?

A dog will be born with 7 legs

Choosing a red apple out of a bag that has 2 red apples and 2 green apples

It will snow in December in Maine

The Penguins will go to the playoffs

The sun will set tonight

Rolling a 7 using one dice

Unlikely

Equally Likely

Likely

Maybe

Certain

Impossible

Probability with Spinners

- When finding the probability using a spinner, we use fractions to discuss the possibility of outcomes.
- The spinner below is split into 4 equal parts so the is our denominator
- Our numerator is the chances of the outcome to happen. For example, the probability of the spinner landing on a 3 is ¼. There is one section that has a 3 so 1 section out of 4 is our probability.

Let’s try some

- Using the spinner what is the probability of landing on a 1,2, or 3?
- What is the probability of landing on a a red?

3/4

2/4 OR 1/2

Some more practice

- What is the probability of the spinner landing on blue?
- In which spinner is the probability of landing on green 3/8?

2/5

BRAINPOP

- Here is a Brainpop video to help us review what we just learned!

http://www.brainpopjr.com/math/data/basicprobability/

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