Circumference of Circles

If you are given the radius of a circle how could you find the diameter of the same circle?

• Multiply the radius by 3.14

• Multiply the radius by 2

• Multiply the radius by 1/2

• Divide the radius by 2

If my radius is 10 ft, what is my diameter?

• 5 ft

• 20 ft

• 31.4 ft

• 62.8 ft

If you are given the diameter of a circle how could you find the radius of the same circle?

• Multiply the diameter by 3.14

• Multiply the diameter by 2

• Multiply the diameter by 1/2

• Divide the diameter by 3

What is the radius of the pictured circle?

• 12.5 cm

• 25 cm

• 50 cm

• 78.5 cm

If the circumference of a circle is 76 inches what is the diameter (rounded to the nearest hundredth)?

• 12.1 inches

• 15 inches

• 24.2 inches

• 26 inches

Find the circumference, rounding your answer to 1d.p.

• 31.4cm

• 15.7cm

• 62.8cm

• 78.5cm

Find the circumference, rounding your answer to 1d.p.

• 21.9cm

• 22.0cm

• 44.0cm

• 11.0cm

Find the circumference, rounding your answer to 1d.p.

• 9.4mm

• 18.8cm

• 18.8mm

• 4.7mm