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5a=90 derajat
a=90/5
a=18 derajat
3a + 2a = 90"
5a = 90"
a = 18"
gambar II
46" + (a+29)" + (5a-15)" = 180"
6a" + 60 = 180"
a + 10 = 30"
a = 20"