2D shapes

Circles

Name: ______________________________Date: ______________Score: ______ / 20

1.
What is the perimeter of a circle called?
1. ARadius
2. BDiameter
3. CCircumference
4. DCentre
2.
The diameter of a circle is twice the radius.
True False
3.
A circle has a radius of 3 cm. What is its diameter?
cm
4.
A circle has a diameter of 8 cm. What is its radius?
cm
5.
A circle has a radius of 2.5 cm. What is its diameter?
cm
6.
A circle has a diameter of 4 cm. What is its radius?
cm
7.
A diameter must pass through the centre of the circle.
True False
8.
Bryn ran all the way around the outside of the circular lawn. Which part of the circle did he run along?
1. ARadius
2. BCircumference
3. CDiameter
4. DCentre
9.
A circle drawn with a radius of 3 cm is the same size as a circle drawn with a diameter of 60 mm. (Remember 1 cm = 10 mm.)
True False
10.
A circle has a radius of 20 mm. What is the radius in centimetres? (1 cm = 10 mm)
cm
11.
The radius of a circle is longer than its diameter.
True False
12.
Put these circles in order, from the smallest to the largest.
Write the order (smallest to largest circle) in the boxes:
- ?radius 5 cm
- ?diameter 6 cm
- ?diameter 20 cm
- ?radius 2 cm
13.
The circumference is a straight line across the circle.
True False
14.
A circle has a radius of 11 cm. What is its diameter?
cm
15.
A circle has a diameter of 18 cm. What is its radius?
cm
16.
What is the distance right across the circle through the centre?
1. ARadius
2. BDiameter
3. CCircumference
17.
A circle has a diameter of 34 cm. What is its radius?
cm
18.
A circle has a radius of 14 cm. What is its diameter?
cm
19.
A circle has a radius of 2 cm. What is its diameter?
cm
20.
A circle has a diameter of 28 cm. What is its radius?
cm

Answer key

2D shapes — Circles

1.C. Circumference
2.True
3.6 cm
4.4 cm
5.5 cm
6.2 cm
7.True
8.B. Circumference
9.True
10.2 cm
11.False
12.radius 2 cm, diameter 6 cm, radius 5 cm, diameter 20 cm
13.False
14.22 cm
15.9 cm
16.B. Diameter
17.17 cm
18.28 cm
19.4 cm
20.14 cm