Answers

2015-09-17T23:37:20+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
We can prove this by using Pythagoras theorem.  At B we have a right angle.

In the triangle, ABE,  we get:  AE² = AB² + BE²

In the triangle  DBC, we get :  CD² = DB² + BC²

adding the above two equations. we get:
    AE² + CD² = (AB² + BC²) +( DB² + BE²)
                   =  AC²  +  DE²

This equation will be true for a quadrilateral with two adjacent sides being perpendicular.

1 5 1
click on thanks button above please
select best answer pls