python 已知三条边求三角形的角度

import math
a=1;//边1
b=1;//边2
c=math.sqrt(2);//边3
A=math.degrees(math.acos((a*a-b*b-c*c)/(-2*b*c)))//夹角1
B=math.degrees(math.acos((b*b-a*a-c*c)/(-2*a*c)))//夹角2
C=math.degrees(math.acos((c*c-a*a-b*b)/(-2*a*b)))//夹角3

print(A)
print(B)
print(C)