Answer:
D.
(The only option that makes sense is D. but I came up with 10°F when I did the math)
<u><em>~ LadyBrain</em></u>
You add the numbers of all 4 sides.
If you divide the circumference C over the radius r, you get 2pi
2pi = C/r
this is because
C = 2pi*r
is one formula to find the circumference. Another formula is
C = pi*d
which works because d = 2r, ie the diameter is twice the radius.
