Question

The circumference of a circle is 30 millimeters. What is its diameter? Estimate, using 3 for π.

Answer 1

Please Help!

Answer 2

do you know how the circumference of a circle is realted to its radius/diameter?

Answer 3

not really sorry ;(

Answer 4

the relation is as follows:\[C=2\pi r=\pi D\]where C is the circumference, r is the radius and D is the diameter. also note that:\[D=2r\]can you solve it now?

Answer 5

no don't get it

Answer 6

can you work it out?

Answer 7

please

Answer 8

do you want to learn how to do this or do you just want the answer?

Answer 9

i want both please

Answer 10

are you still here?

Answer 11

ok, so we are given the circumference (C=30 mm) and we are asked for the diameter D. so we can use this equation:\[C=\pi D\]we can re-arrange this as:\[D=C/\pi\]we are also told to estimate the answer by using the value 3 for PI, so we get:\[D\approx C/3=30/3=10\]so D is approximately 10 mm.

Answer 12

thanks alot!