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= 60° × 1 = 60° < 90° (sudut lancip)
b. 2/3 × 360° = (360° : 3) × 2
= 120° × 2 = 240°< 360° (sudut tumpul)
c. 180° - 5/6 × 180 = 180° - (180° : 6) × 5
= 180° - 30° × 5 = 180° - 150° = 30° < 90° (sudut lancip) maaf kalau salh