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= 55 derajat
b. besar sudut ketiga = 180- 2 x 30
= 120 derajat
c. besar sudut ketiga = 180 - 84 - 62
=34 derajat
d. besar sudut ketiga = 180 - 80 - 53
= 47 derajat
mohon jadikan jawaban tercerdas :D