*In the given figure a + b = c + d then prove that LOM is a straight line .
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A + B + C + D = 360 degrees
But A+ B = C+D
This implies, A+B+A+B=360
2A+2B=360
2(A+B)=360
A+B=180
Since angle A + angle B = 180
Therefore LOM is a straight line
But A+ B = C+D
This implies, A+B+A+B=360
2A+2B=360
2(A+B)=360
A+B=180
Since angle A + angle B = 180
Therefore LOM is a straight line
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