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