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a = 180 / 3 = 60 derajat
30. 5 a = 90
a = 90/5 = 18 derajat
a + 3a = 180°
4a = 180°
a = 180/4
a = 45°
3a = 3(45)
= 135°
besar sudut itu 135°
30. misal sudut itu 5a
a + 5a = 90°
6a = 90°
a = 90/6
a = 15°
5a = 5(15)
= 75°
besar sudut 75°