 A trapezoid was created by cutting a parallelogram. The upper side of this trapezoid is 15 centimeters (cm) and the lower side is 9 centimeters (cm). If the height of the trapezoid is 12 centimeters (cm), how many centimeters (cm) is the side of a square with the same area as the trapezoid?
15 9 [OP_ADD] 12 [OP_MUL] 2 [OP_DIV] 1/2 [OP_POW]
var_a = 15
var_b = 9
var_c = var_a + var_b
var_d = 12
var_e = var_c * var_d
var_f = 2
var_g = var_e / var_f
var_h = 0.5
var_i = var_g ** var_h
print(int(var_i))