from math import sqrt
a = int(input("a = "))
b = int(input("b = "))
c = int(input("c = "))
CAB=(sqrt(c)-sqrt(a)-sqrt(b))/(-2*a*b)
CBA=(sqrt(a)-sqrt(b)-sqrt(c))/(-2*b*c)
ACB=(sqrt(b)-sqrt(a)-sqrt(c))/(-2*a*c)
print("CAB = ",CAB)
print("CBA = ",CBA)
print("ACB = ",ACB)
2)
from math import sqrt
r = int(input("r = "))
pi = 3.14
c = 4/3
V = c* pi *sqrt(r)*r
print("V = ",round(V,2))