Question

ABCD is a square prove that AC square =2AB square

Answer 1

As abcd is a square so it's all side are equal and each angle is equal to 90°

Now,In right angled triangle ABC...
by Pythagoras theorem,
Ac^2=AB^2+BC^2
as AB=BC...
SO,
AC^2=2AB^2
PROVED.....

Answer 2

Answer:

hope the above image helps you