CBSE Class 10 Maths (Standard) 2019 · Paper 30/3/1 · Question 13(a)

Triangles 3 marks Medium

The perpendicular from

A

on side

B C

of a

△ A B C

meets

B C

D

such that

D B = 3 C D

. Prove that

2 A B^{2} = 2 A C^{2} + B C^{2}

Answer

Hence

2 A B^{2} = 2 A C^{2} + B C^{2}

, as required.

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