I made a square with a long piece of string, and each side was 21 centimeters (cm). If you use this string to make the largest triangle among triangles with a length of the three sides equal, how many centimeters (cm) will each lengths of a side be?
21 4 [OP_MUL] 3 [OP_DIV]
var_a = 21
var_b = 4
var_c = var_a * var_b
var_d = 3
var_e = var_c / var_d
print(int(var_e))