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60 60
= 120 + 15
= 135
6 x 30 = 180
= 180 - 135
= 45 derajat (sudut lancip)
b.7 20 x 30 = 7 x 30 + 20 x 30
60 60
= 210 + 10
= 220
4 x 30 = 120
= 220 - 120
= 100 derajat (sudut tumpul )