Circles

What is the formula for circumference of a circle given the diameter?

• C = π r
• C = 2 π r
• C = π d
• C = 2 π d

What is the formula to find the area of a circle?

• A = πd

• A = 2πr

• A = πr²

• A = xyz

What is the area of this circle?

• 163.2
• 15.3
• 124.2
• 113.1

What is the area of this circle?

• 62.59
• 113.1
• 19.81
• 28.27

What is the diameter?

• 5 in
• 10 in
• 3.14 in
• 15.84 in

A circular swimming pool is 21 feet in diameter. What is the circumference of the pool?

• 10.5 ft
• 42 ft
• 65.97 ft
• 131.95 ft

Find the circumference with a radius of 5.8 cm. Use 3.14 for pi.

• 37 cm

• 38.3 cm

• 36.4 cm

• 42.7 cm

What is the measure of ∠PTQ?

• 100°
• 140°
• 180°
• 120°

Find the measure of arc JH

• 93
• 130
• 120
• 95

Solve for x. 

• 5
• 20
• 40
• 85