IN the given figure,BC is parallel to DE .if <ABC=40 degree and <ADE=120 degree,find X
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given:ADE=120
ABC=40
Construction:draw a line AX from point A
ADE=XAD. alternate angles
XAB=ABC. alternate angles
ADE=BAD+XAB
120=XAB+BAD
120=40+BAD
BAD=120-40=80
x=80
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