Circle review

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

• 20ft
• 5ft
• 31.4ft
• 62.8ft

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

• 38 inches
• 9.5 inches
• 59.66 inches
• 119.32 inches

If my radius is 2 yd what is the circumference?

• 4π yd

• 1π yd

• 2π yd

• 6π yd

If my diameter is 90cm, what is my circumference?

• 90π cm

• 180π cm

• 45π cm

• 56π cm

If my circumference is 52π ft, what is my radius?

• 52ft

• 26ft

• 3.14ft

• 163.28ft

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

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

The local rodeo has a circular pin, with a diameter of 48 feet, in which they keep the horses. What is the circumference of the horse pin?

• 150.72 feet
• 140.72 feet
• 130.72 feet
• 160.72 feet

if the circumfrance of a circle is 24cm, what is the radius? round to the nearest hundredth.