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50 + 2 + 3 = 180 derajat
5 = 130 derajat
= 26 derajat
Besar sudut b = 2
= 52 derajat
Besar sudut 3 = 3
= 78 derajat
(180-50) : 5 = 26
Sudut b = 26 x 2 = 52
Sudut c = 26 x 3 = 78
Maaf kalo salah.................