Abc is and isosceles triangle right angled at c. prove that absquare =2acsquare

See below.

Step-by-step explanation:

AB is the hypotenuse because it is opposite the right angle C.

By the  Pythagoras Theorem:

AB^2 = BC^2 +AC^2

But BC = AC because the triangle is isosceles, therefore:

AB^2 = 2AC^2.

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc