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3/12 x 180= 45 derajat
7/12 x 180=105 derajat
sudut a = 2x
sudut b = 3x
sudut c = 7x
besar sudut a = 2x/12x × 180 = 2/12 × 180 = 30°
besar sudut b = 3x/12x × 180 = 3/12 × 180 = 45°
besar sudut c = 7x/12x × 180 = 7/12 × 180 = 105°