Area and Circumference of Circles

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2

• Divide the diameter by 2

• Add 2 to the diameter

• Subtract 2 from the diameter

A Circle has a radius of 6 inches.  What is the circumference of the circle? (Best Choice)

• 3π or about 9.42 in

• 6π or about 18.84 in

• 12π or about 37.68 in

• 36π or about 113.04 in 

A city is designing a new garden. A scale drawing of the garden is shown below. What is the circumference of the garden?

• 628 feet

• 200 feet

• 100 feet

• 542 feet

Find the circumference with a radius of 5.8 cm.

• 37 cm

• 38.3 cm

• 36.4 cm

• 42.7 cm

What is the area of this circle?

• 1256.64 sq. in.

• 31.41 sq. in.

• 314.16 sq. in.

• 123.12 sq. in.

What is the area of this circle?

• 6082.12 sq. ft.

• 1520.53 sq. ft.

• 1893.14 sq. ft.

• 1292.92 sq. ft.

How much orange paint is needed to paint the entire circle?

• 50.27 sq. cm.

• 78.23 sq. cm.

• 98.12 sq. cm.

• 201.06 sq. cm.

How much fencing is needed to go around the entire garden?

• 88 in

• 44 in

• 116 square in

• None of the above

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