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This is an mensurational problem of triangles.

In triangle ABC, anngle B=90degrees and D is the mid point of AC .If AB=20 cm and Bd=14.5cm,find the area and perimeter of the triangle ABC.

My book says that BD=AD=DC=> AC=2BD=29 and so on

But i can't get how could they just write that BD=AD??

I am really at my wits end.

If we take this into consideration it is really easy but how do I do it when I iam not clear at the base.

I tried to prove the angles equal to prove the sides but it's not working.

Please help!

## Homework Statement

In triangle ABC, anngle B=90degrees and D is the mid point of AC .If AB=20 cm and Bd=14.5cm,find the area and perimeter of the triangle ABC.

My book says that BD=AD=DC=> AC=2BD=29 and so on

But i can't get how could they just write that BD=AD??

I am really at my wits end.

If we take this into consideration it is really easy but how do I do it when I iam not clear at the base.

I tried to prove the angles equal to prove the sides but it's not working.

Please help!

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