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

Question

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

anonymous · Answer

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

campbell_st · Answer

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

anonymous · Answer

so confused so the answer is 480

anonymous · Answer

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

campbell_st · Answer

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