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2x+20 ° + x + 10° = 180 °
3x + 30 ° = 180°
3x = 180° - 30°
3x = 150°
x=50°
S = 90°
3y°= 90°
y° = 90° ÷ 3
y° = 30°
R = 90°
x+10° = 90°
x= 90°- 10°
x = 80 °
sudut R =
90 °
sudut S
90 °