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1. diameter = 20 & panjang busur AB = 60 derajat / 360
AB = derajat x keliling lingkaran
= 60 derajat / 360 derajat ( π x diameter)
= 1/6 x (3,14 x 20)
= 1/6 x 62,8
= 10,46 cm
2. luas juring OAB
72/30 = 120/AOB
72OAB = 120 x 30
72OAB = 3.600
OAB = 3.600/72
OAB = 50