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2.5/6x360=300 derajat
3.1/4x360=90 derajat
putaran penuh= 360°
I. 4/5 × I80° = I44° = sudut tumpul
2. 5/6 × 360° = 300° = sudut tumpul
3. I/4 × 360° = 90° = sudut siku-siku