Answer:
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.
[tex]Answer: \\ Pythagorean \: theorem \: of \bigtriangleup ABC: \\ {AB}^{2} = {AC}^{2} + {BC}^{2} = {AC}^{2} + {AC}^{2} = 2{AC}^{2} \\ because \: \bigtriangleup ABC \: is \: an \: isosceles \: traingle \: at \: C[/tex]
