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5a + 10 = 90°
5a = 90 - 10
5a = 80
a = 80 : 5
a = 16
Jadi penyiku <AOB = 2a = 2 x 16 = 32 (A)
2a + 3a = 90 - 10
5a = 80
a =
a = 16
<AOB = 2a''derajat
= 2.16
= 32''derajat
Jawabannya adalah A