Problem: the total surface area of a solid hemisphere of diameter 14 cm , is :
Rationale: sol . total surface area = 3 ∏ r ² = [ 3 * 22 / 7 * 7 * 7 ] cm ² = 462 cm ² answer a
annotated_formula: multiply(multiply(const_3, const_pi), power(divide(14, const_2), const_2))