Question

Mathematics word problem. Please show working out, 25 points.

Answer 1

188.5 cm

Explanation:

Circumference of a circle = C = 2πr = πD

D = 30 cm

C = π(30 cm) = 94.25 cm

2 revs = 2C = 2(94.25) = 188.5 cm

Answer 2

188 cm rounded to the nearest whole number.

Explanation:

1 rotation = 2
`\pi`r

2
`\pi`(15) If the dimeter is 30, the radius is 15

2 rotations would be

2[2
`\pi`(15)]

188.495559218