MATH
GOALS/OBJECTIVE
S
Students will be able to find the areas of
polygons by composing and decomposing
them into other shapes and be able to
solve problems with these techniques.
Let’s Review!
• What is perimeter?
• When do we need to find the
perimeter of a shape?
• What are the 3 formulas we can
use to find perimeter of a shape?
• If the outside of a shape is called
perimeter, what is the space
inside of the perimeter called?
• When do we need to find the
area of a shape?
• How are perimeter and area
related and how are they
different?
So how do we find the area of a shape?
Let’s find out.
https://youtu.be/cAI_twrP8QE
Let’s Recap…
Rectangle with dimensions:
4 inches by 3 inches
We use the formula L x W. What is 4 x 3?
Same shape divided into 12 unit squares
My backyard
• How do I find out how much
fencing I need for my backyard?
• How do I find out how much
grass I need to cover the ground?
Measurements of my backyard:
Length = 10 feet
Width = 6 feet
GROUP ACTIVITY
• Find Perimeter and Area for the following:
• Post-It
• Blue Sheet of Paper
• Chromebook
Let’s see what we learned!
Assignment: Complete worksheet: Area of a Rectangle