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CBD dgn CBE
ABE = 60
CBE + ABE = 180
CBE= 180 - ABE = 180-60 = 120
CBE= ABD = 120
CBD= ABE= 60
soal nmr 2 kurang jelas, maaf
- < ABD dan < CBD
- < CBD dan < CBE
- < CBE dan < EBA
- < EBA dan < ABD
b) < ABE = 60°
< CBD = < ABE = 60° (sudut saling bertolak belakang)
< ABD = < EBC = pelurus dari < ABE
= 180° - 60°
= 120°