A is right angled at A. If AL BC, prove that = .

Question

Philoid · Accepted Answer

proof

We know that the sum of two acute angles of a right triangle is 90°.

Therefore,

+=90°

= 90°-

= 90°-____________________ (i)

+=90°

= 90°-____________________ (ii)

From equation (i) and (ii),

= Proved.