Carry the Answer to Four Decimal Places $20 ^ { \circ }$

Short Answer

Carry the answer to four decimal places. Determine the circumference (C) of a grinding wheel if the diameter (d) is 12 inches. Use the following formula: C = $20 ^ { \circ }$ d where ${ } ^ { \circ } \mathrm { C } = 5 / 9 \left( {}^ { \circ }F - 32 ^ { \circ } \right)$ = 3.1416