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Jika saling berpelurus maka:
a + b = 180°
(2/3)b + b = 180°
(5/3)b = 180°
b = 108°
a = (2/3)108° = 72°
Jika saling berpenyiku maka:
a + b = 90°
(2/3)b + b = 90°
(5/3)b = 90°
b = 54°
a = (2/3)54° = 36°
A=2/5×180=72
B=3/5×180=108
A=2/5×90=36