Sum No. 4 Exercise 6.5 class 10th

 SUM NO.4:-ABC is an isosceles triangle right angled at C. Prove that
 AB2=2AC2
Solution :- Using Pythagoras theorem in △ACB 

AB2=AC2+BC2

AB2=AC2+AC2  (AC=BC)

              (ABC is an isosceles triangle right angled, ∴ AC=BC)

so, AB2=2AC2