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( 180 - x) + ( 90 -x) = 150
- 2x = 150 - 180 - 90
- 2x = -120
x = 60:.
penyiku = 90 - α
pelurus = 180 - α
penyiku + penlurus = 150
90 - α + 180 - α = 150
270 - 2α = 150
270 - 150 = 2α
120 = 2α
α = 60