Circles
Divide and Conquer
Know your 12's
X Marks the Spot
Perimeter
100
What is the diameter of a circle with a radius of 3 in.?
6 in.
100
42-:7 =
6
100
12 * 7 =
84
100
17 = 3x + 5
x = 4
100
What is the perimeter of this square?
24 in.
200
What is the circumference of the circle above?
8ℼ cm
200
36-:9 =
4
200
12 * 8 =
96
200
4x + 12 = 10x
x = 2
200
What is the perimeter of a triangle with each side measuring 5cm?
15 cm
300
What is the circumference of a circle with a radius of 7 ft.?
14ℼ ft.
300
64-:8 =
8
300
12*11=
132
300
6x - 5 = 11 + 2x
x = 4
300
What is the perimeter of a rectangle with side lengths 2 ft and 4 ft?
12 ft
400
If a circle has a circumference of 12ℼ in., what is the diameter of the circle?
12 in.
400
54 -: 6 =
9
400
9*12
108
400
9 - 3x = 5 + x
x = 1
400
What is the perimeter of this shape?
60 in.
500
If a circle has a circumference of 24ℼ cm., what is the radius of the circle?
12 cm
500
72 -: 12 =
6
500
12*12=
144
500
4x + 11 = 6x + 1
x = 5
500
If a square has a perimeter of 16 in., what is the length of each side?
4 in.