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a + b = 180°
3b + b = 180°
4b = 180°
b = 180°/4
b = 45°
a = 3b
a = 3(45°)
= 135°
Jadi a = 135° , b = 45° (B)
a = 3b
Kita coba masukan nilai a dan b dengan pilihan yang tersedia
(A)a = 45
b = 135 (3 x 45)Benar
(B)a = 135 (3 x 45)Terbalik
b = 45
(C)a= 55
b = 125 (3 x 55 = 165) Salah
(D)a = 125
b = 55 Salah
Jadi, jawaban yang benar adalah (A)
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