Question

PQR is an isosceles triangle with QP=QR . if PR=2QR, prove that ∆PQR is right angled​

Answer 1

lit is given that pr=2qr

so squaring on both sides,

pr^2=2qr^2

pr^2=qr^2+qr^2

pr^2=qr^2+qp^2 ( qr=qp)

hence the Pythagoras theorem is proved

it is a right angled triangle