INGAT! JUMLAH SUDUT SEGITIGA PASTI 180°.
3x + 40° + (180°-5x) = 180°
-2x + 40° + 180° = 180°
-2x = 180° - 40° -180°
-2x = -40°
x = 20°
sudut QPR = 3x
3 × 20 = 60°
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INGAT! JUMLAH SUDUT SEGITIGA PASTI 180°.
3x + 40° + (180°-5x) = 180°
-2x + 40° + 180° = 180°
-2x = 180° - 40° -180°
-2x = -40°
x = 20°
sudut QPR = 3x
3 × 20 = 60°