Perhatikan gambar ! Jika besar ∠a = 3x + 15°, dan besar ∠b = 2x + 15°, nilai x adalah
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Jawaban:
∠a + ∠b = 90°
(3x + 15°) + (2x + 15°)=90°
(3x + 2x ) + (15° + 15°)=90°
5x + 30 =90°
_______________=
_____________ = 5x = 90-30°
_____________= 5x = 60°
___________X = 60 : 5x
___________X = 12°
jadi hasilnya 12°
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