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120° = 3x + 5 + 5x - 5
120° = 8x
x = 120°/8
x = 15°
∠ BCA = 5x - 5
= 5 .15 - 5
= 75 - 5
= 70°
2) ∠ A + ∠ B = 180°
∠ A : ∠ B = 2 : 3 ⇒ jumlah perbandingan = 2 + 3 = 5
∠ A = 2/5 x 180°
= 2 x 36°
= 72°
∠ C = ∠ A
= 72°
3) keliling = 2( 13 + 12 + 12 + 5 + 5)
= 2 ( 47)
= 94 cm
4) ∠ ACB = 90° - 35°
= 55°
∠ CBD = ∠ ACB
= 55°