My question is that- If two straight line intersect each other in such a way that one of the angle formed measures 90? show that each of the remaining angles measure 90? [I did this ques with 2 method pls guide me which one is wrong or both are wrong or both the methods are correct] ; after last step of my given ans of method 2 is angle AOB = AOC= 90? [VOA]
?angle AOB=AOC=COD=BOD=90? hence proved (these two steps are in continuity of method 2) pls help pls

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This the last 2 steps of method two I waa unable to post both images their thats whi i posted it in answers ....

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