Circles
Circumference
Area
Area squares
perimeter shapes
100
The area of a circle formula is
A=πr2
100
A circle has a radius of 3.
What is it's circumference?
can use a calculator
18.84
100
area = ?
78.5 cm
100
Area of a square with sides 2 cm =
L x W = area
2 x 2 = 4cm
100
a square has sides 4 inches long
What is it's diameter?
4 + 4 + 4 + 4 = 16
200
The circumference of a circle formula is
circle formula = 2πr
200
A circle has a radius of 1.
What is it's circumference?
Can use a calculator
6.28
200
A circle has a radius of 2.
What is it's circumference?
can use a calculator
12.56
200
Area of a square with sides 4 cm =
4 x 4 = 16
200
a square has sides 1.5 inches long
What is it's diameter?
4 x 1.5 = 6
300
spell circumference
circumference
300
A circle has a radius of 10.
What is it's circumference?
can use a calculator
62.8
300
A circle has a radius of 1.
What is it's area?
can use a calculator
3.14
300
Correct or wrong?
The area of a square with sides 2 feet long is 4 ft
Correct
300
What is the perimeter of this shape?
40 feet
400
π stands for
pi
400
A circle has a radius of 20.
What is it's circumference?
can use a calculator
125.6
400
A circle has a radius of 10.
What is it's area?
can use a calculator
314
400
Correct or wrong?
The area of a square with sides 3 feet long is 6 ft
wrong
3 x 3 = 9 feet
400
What is the perimeter?
38 cm
500
Pi = ?
3.14
500
Circumference= ?
31.4 cm
500
area = 
r = 18
so
area = 1017.36
500
Area of a square with sides 3.75 cm =
3.75 x 3.75 = 14.0625
500
True or false. The diameter of this rectangle is 90 inches.
True 30 + 30 + 15 + 15 = 90 inches