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sudut pelurus = 180°
sudut : penyiku = 3 : 7
Besar sudut : 3/7 × 90° = 38,6°
Pelurus : 180° - 38,6° = 141,4°
Maaf kalo ada yang salah
sudut + penyiku = 3x + 7x = 90⁰ = 10x
x = 90/10 = 9
sudut = 9 . 3 = 27⁰
sudut pelurusnya = 180⁰ - 27⁰ = 153⁰