The circumference formula is
C = \(2 \pi\)r
We know the circumference, so lets find the radius and we will get the diameter.
31.4 = 2\(\pi r\)
divide by 2\(\pi\) to isolate r
\(\frac{31.4}{2 \pi }\) = \(\frac{2 \pi r}{2 \pi }\)
2\(\pi\) and 2\(\pi\) cancels out.
0.4997 = r
0.5 in ≈ r (approximately)
Diameter is 2 × radius
2 × 0.5
1 in
