the perimeter of a rhombus is 68 cm and one of its diagonals is 16 cm . find its area ?
"4 a = 68 = > a = 17 172 – 82 = 152 1 / 2 * 16 * 30 = 240 answer : b"
multiply(sqrt(subtract(power(divide(68, const_4), const_2), power(divide(16, const_2), const_2))), const_2)