Jika besar ∠BAC =2x° dan besar ∠ABC = 3x° , maka besar ∠ABC = .....
A. 24°
B. 36°
C. 48°
D. 54°
A. 24°
B. 36°
C. 48°
D. 54°
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Gambar yang Terlampirkan
∠BAC + ∠ABC + ∠ACB = 180°
2x + 3x + 90° = 180°
5x = 90°
x = 18°
Maka Besar ∠ABC = 3x = 54°
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2x + 3x + 90° = 180°
(2 + 3)x = (180 - 90)°
5x = 90°
x = (90/5)°
x = (18/1)°
x = 18°
<ABC = (18 × 3)
= 54° (D)
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