Question

question?nnnnnnnnnnn?nnnnn 5​

Answer 1

hey mate

this is not a question it's a well proved theorem.

so u have to learn it

hope u find it helpful

Answer 2

we need to put this by the method of contradiction

we will make another Triangle PQR right angled at Q

on applying pythagoras in triangle pqr and abc

replace ab and bc by pq and qr

then we will get AC equal PR

and therefore

angle b=90°

thats it