Question

Find the exact circumference in terms of pi of a circle with the given radius. 5 inches

Answer 1

given: r = 5
C = 2(pi)r = 2 *3.14*5 = 31.4 in

Answer 2

That's what I got also, but it says exact answer and what does that mean?

Answer 3

C = 2πr = πd --- (where r = radius, d = diameter = 2 times the radius)

C = r * (2π) = r * (6.283) --- (π = Greek letter pi = 3.1415...)

So, for your problem where the radius, r, is given as 5 inches:

C = 5 * (2π) = 10π = 31.415... inches

--- (since this number goes on indefinitely,
"10π inches" is about the most exact you can get without rounding)

Answer 4

it says "exact answer in terms of pi"
this means oyu do NOT evaluate pi

the circumference is 2 pi r
in this case C= 10π