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5a + 35 = 180
5a = 180-35
5a = 145
a = 145/5
a = 29
nilai
2a = 2 x 29
= 58
nilai
3a = 3 x 29
= 87
Cari jumlah 2a+3a
dgn 180-35 = 145.
2a+3a= 5a
a= 145÷5
a= 29
2a= 2.29
= 58°
3a= 3.29
= 87°