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9a = 180
a = 180/9
a = 20
sudut terkecil = 2a
= 2(20)
=40
semoga bermanfaat... :)
sudut segitiga = 180°
x = 180 ÷ 9 = 20°
S = sudut
Sa = 4x = 4 × 20 = 80°
Sb = 3x = 3 × 20 = 60°
Sc = 2x = 2 × 20 = 40°
terima kasih ^_^