in the figure, AOB and COD are straight lines.If x+y+z=180,prove that EOF is a straight line.
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Given, x+y+z=180
COB = AOD [ Vertically opposite angles]
AOD = z
AOE = BOF [ Vertically opposite angles]
BOF = x
EOC = DOF [ Vertically opposite angles]
EOC = y
AOD + BOF + EOC = 180°
Also, x + y + z = 180 °
AOE + AOD + DOF = x + z + y = 180°
Hence, it forms Linear pair.
So, EOF is a straight line.
COB = AOD [ Vertically opposite angles]
AOD = z
AOE = BOF [ Vertically opposite angles]
BOF = x
EOC = DOF [ Vertically opposite angles]
EOC = y
AOD + BOF + EOC = 180°
Also, x + y + z = 180 °
AOE + AOD + DOF = x + z + y = 180°
Hence, it forms Linear pair.
So, EOF is a straight line.
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