Answers

2014-11-20T22:16:50+05:30
let the two intersecting  lines be AB & CD,let O be point of their  intersection
<AOC+<COB=180
⁰----------------------1
<AOC+<AOD=180⁰-----------------------2
FROM 1 & 2
<AOD=<COB
similarly <DOB=<AOC

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