Question

Estimate the circumference of the following circles:
d = 10cm
r = 7 cm
d = 15 m

Answer 1

1. 31.42cm

2. 43.98cm

3. 47.12cm

Explanation:

Multiply the diameter by pi,

Since the radius is just half of the diameter, make it 14 then multiply by pi

Answer 2

43.98

Explanation:

Circumference= 2πr

so it would be 2x3.14x7=43.98