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450-5x=360-2x
3x=90
x=30°
1/6 * 30 = 5°
2. 180-x=3(90-x)
180-x=270-3x
2x=90
x=45°
1/3 pelurus = 1/3 (180-45) = 45°
1/3 penyiku = 1/3 (90-45)=15°
3. 180-1/4(90-x)=10+4(90-x)
180-22,5+0,25x=10+360-4x
4,25 x = 212,5
x = 50°
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