angles in quadrilateral

What size have angles in quadrilateral (4-gon) if they are in a ratio of 8: 9: 10: 13?

Correct result:

a =  72 °
b =  81 °
c =  90 °
d =  117 °

Solution:

a=360/(8+9+10+13) 8=72
b=360/(8+9+10+13) 9=81
c=360/(8+9+10+13) 10=90
d=360/(8+9+10+13) 13=117



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