1. Circumference & Composite Figures
9.2B & 9.3A

2. The distance AROUND a shape.
Perimeter:
The distance AROUND a shape. a
Just ADD up the sides d b c
a + b + c + d = Per.

3. The distance AROUND a CIRCLE.
Circumference
The distance AROUND a CIRCLE.
There are NO sides?! r d
C = ∏ ∙ D or C= 2 ∙ ∏ ∙ r

4. A shape that is made up of MORE than 1 polygon.
Composite Figures:
A shape that is made up of MORE than 1 polygon. 14 10 8
= 56 10 14
Make sure you have ALL the sides labeled BEFORE adding!

5. As always…watch out for circles!
Find the shapes – Trapezoid & ½ circle.
Use the formula for circles! x 15 = (you may use 3.14 and then cut your answer in 1/2! 15 25 25
Now ADD them up…but remember to LINE up the decimals!
32.5 =

6. Be careful of Tricky shapes with a LOT of missing sides!!!16
To find the side you have to subtract the one side of 14 with the other side of 7! 7 9 14 7 25
To find the top you subtract the bottom 25 from the little 9 piece!
= 78