Area and Circumference of Circles

Which segment is a radius?

• LM

• DC

• BD

• ML

Which segment is the diameter?

• AC

• BD

• LM

• CE

The _____ is the distance from the center to any point on the circle, or the distance halfway across the circle.

• diameter

• radius

• π

• center

The distance across a circle through its center is called the _____.

• diameter

• radius

• π

• center

If the diameter is 19 inches, what is the radius?

• 38 inches

• 9.5 inches

• 59.66 inches

• 119.32 inches

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

• 20ft

• 5ft

• 31.4ft

• 62.8ft

what is the circumference of this circle?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

Enrique purchases an antique bowl for his mom for Mother's Day. The diameter of the bowl is 18 cm. What is the circumference of the bowl? (Round to the nearest whole number.)

• 28 cm

• 57 cm

• 254 cm

• 1017 cm

A circular swimming pool is 21 feet in diameter.
How many feet around is the pool?

• 10.5 ft

• 42 ft

• 65.94 ft

• 131.95 ft

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 11.32 ft

• 12.25 ft

• 10.99 ft

• 8.75 ft