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<C = < A = 30
<BpC = 40 x 2 = 80
<ABE = 180 - 110 - 30 = 40
<CEB = 180 - 110 = 70
<EpB = 180 - 80 = 100
<EBp = 180 - 70 - 100 = 10
<ABP = <ABE + < EBp
= 40 + 10
= 50
jadi besar sudut ABP adalah 50 derajat