Hey,

I have written below code for angel of triangles.

import math def checkio(a, b, c): othline = [a,b,c] otherline = [i*i for i in othline]

mxline = max(a,b,c)
othline.remove(mxline)
a2,b2,c2 = otherline
oth1,oth2 = othline
#print(a2,b2,c2)
# cosA = -a2+b2+c2/2bc for find one angle from given length of triangles
# cosB = a² + c² -b²/2ac   cosC = b² + a² -c²/2ba 
#
tmpA = ((-a2)+b2+c2)/(2*b*c)
tmpB = ((-b2)+a2+c2)/(2*a*c)
tmpC = ((-c2)+b2+a2)/(2*b*a)
A = round(math.degrees(math.acos(tmpA)))
B = round(math.degrees(math.acos(tmpB)))
C = round(math.degrees(math.acos(tmpC)))
result = [A,B,C]
if(A !=0 and B!=0 and C!=0 and ((A+B+C)== 180)):
    return(sorted(result))
else:
    return([0,0,0])

This Code does not word in check io module. also, this code run without any error in my system(ubuntu 16.04). I user python3.