from math import *

tr_a = int(input('Please, input sides for triangle: '))
tr_b = int(input())
tr_c = int(input())

tr_p = (tr_a + tr_b + tr_c) / 2
tr_area = sqrt(tr_p * (tr_p - tr_a) * (tr_p - tr_b) * (tr_p - tr_c))


ra_a = int(input('Please, input 2 sides for rectangle: '))
ra_b = int(input())

ra_area = ra_a * ra_b


ci_r = int(input('Please, input radius for circle: '))

ci_area = pi * ci_r ** 2

print("The areas are:\n Circle={:.2f}, Triangle={:.2f}, Quadrange={:.2f}".format(ci_area, tr_area, ra_area))