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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!.

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polygons
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!
2 dimensional shapes it s all in the name

2-Dimensional ShapesIt’s all in the name

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

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

in terms of probability
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 o ur chances what are the chances that the following events will occur
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
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
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
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

brainpop1
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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