Answers

2015-11-14T21:09:30+05:30
You should assume one diagram
2 lines make an angle ........draw a ⊥r line to each of those lines and extend them such that they intersect at one side
then it forms a quadrilateral we know 2 angles of them are 90°
therefore the remnant angles are equal and equal to 90°









.............................hope this helps u  pls mark as best answer
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