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WorksheetsCircumference and Area of a Circle
Total questions: 20
Worksheet time: 23mins
What does the red line represent?
The circumference of the circle
The diameter of the circle
The radius of the circle
The diameter of a circle is 10 in.
What is its radius?
20 in.
5 in.
Which ratio is used to calculate Pi?
C/r
C/d
r/C
d/C
Calculate the circumference of the circle.
C = π d
98.91 ft.
63 ft.
197.82 ft.
According to the Area of a Circle formula, do you need to know the radius or diameter?
A = π r2
radius
diameter
What is the radius of this circle?
40 cm
20 cm
10 cm
Calculate the Area of the circle.
A = π r2
314 cm2
62.8 cm2
1256 cm2
True or False: The diameter is being pictured here.
True
False
True or False: The diameter is twice as long as the radius.
True
False
The diameter of a circle is 10 inches. What is the radius?
10 inces
20 inches
5 inches
2.5 inches
The radius of a circle is 12 cm. What is the diameter?
Find the circumference of a circle if the radius is 2.5 inches. Use 3.14 for pi.
What is the area of this circle? Use 3.14 for pi.
12.56
25.12
50.24
200.96
Find the area of a circle if the radius is 7 inches. Use 3.14 for pi.
If the radius of a circle is 8 cm, the diameter is 16 cm.
TRUE
FALSE
What does r represent in the formula:
A = π·r2
circumference
radius
diameter
squared
radius = 8 m
