1. Area of Circles
TeacherTwins©2014

2. Warm Up
Find the circumference of each circle.
1) ).
3). 4).
9.42 ft.
31.4 in
3 ft.
5 in
43.96 yd.
81.64 cm
26 cm
7 yd.

3. Flippable

4. Area
The area of a circle is found by multiplying pi(3.14) and the radius squared (radius x radius).

5. Multiply the radius times the radius. 8 x 8 = 64
Example 1:
Multiply the radius times the radius.
8 x 8 = 64
8 in
Multiply 64 and 3.14 (pi).

6. Example 2:
13 cm

7. 15 in 5 in 12 in 23 in Practice Find the area of each circle. 1). 2).
1) ).
3) ).
15 in
5 in
12 in
23 in

8. Closure Solve the following problem.
The circumference of Jon’s table is feet. What is the area of the table?