If the volume of 4 squares with side length 3 is equal to the volume of a circle, find the length of the radius of the circle. (Note that the pi is calculated as 3.1)
4 3 2 [OP_POW] [OP_MUL] 3.1 [OP_DIV] 1/2 [OP_POW]
var_a = 4
var_b = 3
var_c = 2
var_d = var_b ** var_c
var_e = var_a * var_d
var_f = 3.1
var_g = var_e / var_f
var_h = 0.5
var_i = var_g ** var_h
print('{:.2f}'.format(round(var_i+1e-10,2)))