Circles
Divide and Conquer
Know your 8's
Perimeter
Add It Up
100
What is the diameter of a circle with a radius of 3 in.?
6 in.
100
42-:7 =
6
100
8 * 7 =
56
100
What is the perimeter of this square?
24 in.
100
275 + 180 =
455
200
What is the circumference of the circle above?
8ℼ cm
200
36-:9 =
4
200
9 * 8 =
72
200
What is the perimeter of a triangle with each side measuring 5cm?
15 cm
200
109 + 32 =
141
300
What is the circumference of a circle with a radius of 7 ft.?
14ℼ ft.
300
64-:8 =
8
300
8*11=
88
300
What is the perimeter of a rectangle with side lengths 2 ft and 4 ft?
12 ft
300
736 + 125 =
861
400
If a circle has a circumference of 12ℼ in., what is the diameter of the circle?
12 in.
400
54 -: 6 =
9
400
8*8
64
400
What is the perimeter of this shape?
60 in.
400
541 + 12 =
553
500
If a circle has a circumference of 24ℼ cm., what is the radius of the circle?
12 cm
500
72 -: 12 =
6
500
8*12=
96
500
If a square has a perimeter of 16 in., what is the length of each side?
4 in.
500
896 + 432 =
1,328