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= 30/360 = a/125,6cm
P. busur = 125,6 x 30 / 360
P. busur = 10,467 cm
b. a drjt / 360 = Luas Juring / L. Lingkaran
= 45/360 = LJ / 1256 cm2
LJ = 1256 x 45 / 360
LJ = 157 cm2