Question

The circumference of a circle varies directly with its radius.

If the circumference of a circle with a radius of 1.5 in. is 9.42 in.,

what is the circumference of a circle with a radius of 9 in.?

Use π=3.14. Round your answer to the nearest inch.

Answer 1

1) Circumference = 2πr

C = 2 x π x 9

C = 18π = 56.548... = 57 inches (to the nearest inch)

2) 6h = $52.50

1h = $52.50/6 = 8.75

11h = 8.75 x 11 = $96.25 = $96 (to the nearest cent)

(57)