Circles

If the diameter is 48m, what is the radius?

• 96m

• 24m

• 12m

• 4m

A circle has a DIAMETER of 20m. What is the circumference of this circle?

• 31.4m

• 62.8m

A circle has a RADIUS of 15 cm. What is the CIRCUMFERENCE of this circle?

• 47.1 cm because you multiply 15 and π

• 94.2 cm because you multiply 30 and π

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

• c = π15

• C = 2π15

• c = 15 ÷ π

• c = 15 π²

If the radius of a circle is 12.5 metres, the diameter is ____

• 6.25 m

• 125 m

• 25 m

• 50 m

What is the radius of this circle?

• 12 cm

• 6 cm

• 24 cm

• 3 cm

The radius is 8 m.  What is the circumference?

• 50.24 m

• 25.12 m

• 12.56 m

• 200.96 m

Ms. Catall uses a compass to find her way out of the woods. The compass has a radius of 4 centimetres. What is the compass's area?

• 49.2 cm²
• 45.6 cm²
• 50.24 cm²
• 55.9 cm²

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area?

• 31.25 m²
• 29.55 m²
• 30.36 m²
• 28.26 m²

The circumference is 62.8 centimetres.  What is the radius?

• 20 cm

• 10 cm

• 6.28 cm

• 31.4 cm