Question

Estimate the radius of the circle with given circumference round answer to the nearest 10th
80km

Answer 1

C=2*pi*r
r=C/(2*pi)
r=80km/(2*pi)

Answer 2

well (80/6) is a good estimate... using 3 as an estimate for pi

Answer 3

so confused so the answer is 480

Answer 4

when they say estimate the circumference, do you tell you use to use 3.14 as pi?

Answer 5

the question is estimate the RADIUS of a circle with circumference of 80 units...

the diameter is 80/3 which is 26 2/3 units... halve this to get the radius

(26 2/3) = 13 1/3 so the radius is approx 13.3 units