Question

find the length of QR​

Answer 1

According to the Pythagoras theorem,

P² + B² = H²

=> 15cm² + QR² = 25cm²

=>225 + QR² = 625cm

=>QR²= 625cm - 225cm

=> QR² = 400cm

therefore, QR =√400cm

= 20cm.

the length of QR = 20cm.

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Answer 2

Answer:

Angle PQR is a right angled triangle

By Pythagoras theorem

$( {hypotenuse})^{2} = ({base})^{2} + ({height})^{2} \\ = ( {25})^{2} = {qr}^{2} + ({15})^{2} \\ = 625 = {qr}^{2} + 225 \\ = {qr}^{2} = 225 - 625 \\ {qr}^{2} = - 400 \\ qr = 20cm$