MEASUREMENTS: Circles

What is the circumference of a circle with a radius of 7 cm?

• Approximately 43.98 cm

• Approximately 50.24 cm

• Approximately 21.99 cm

• Approximately 31.42 cm

If the diameter of a circle is 10 m, what is its circumference?

• 25.12 m

• 31.42 m

• 15.70 m

• 40.84 m

Calculate the circumference of a circle with a radius of 5 inches.

• 31.42 inches

• 40 inches

• 15.7 inches

• 25.12 inches

A circle has a circumference of 31.4 cm. What is its radius?

• 3 cm

• 10 cm

• 7 cm

• 5 cm

What is the length of an arc that subtends a central angle of 60 degrees in a circle with a radius of 4 m?

• 3.14 m

• 4.19 m

• 2.00 m

• 5.24 m

Find the length of an arc in a circle with a radius of 10 cm and a central angle of 90 degrees.

• 10 cm

• 20 cm

• 7.85 cm

• 15.71 cm

If the radius of a circle is 3.5 m, what is the length of an arc that subtends a 120-degree angle?

• 9.00 m

• 7.33 m

• 4.50 m

• 5.25 m

A sector of a circle has a radius of 8 cm and a central angle of 45 degrees. What is the perimeter of the sector?

• 12 cm

• 20 cm

• 10π cm

• 2π + 16 cm

Calculate the perimeter of a sector with a radius of 6 m and a central angle of 30 degrees.

• 9.42 m

• 18.84 m

• 12.56 m

• 15.14 m

What is the perimeter of a sector with a radius of 5 cm and a central angle of 180 degrees?

• 20 cm

• 5 + 10π cm

• 10 + 5π cm

• 15 cm