ΔPQR is a triangle right-angled at P. If PQ = 3 cm and PR = 4 cm, find QR.

3 cm

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7 cm

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5 cm

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8 cm

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Solution

The correct option is C 5 cm
Using Pythagoreas theorem, we have,

QR² = PQ² + PR²

QR² = 3² + 4²

QR² = 9 + 16

QR² = 25

QR = 5 cm

Hence option C is correct.

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Similar questions

PQR is a triangle right angled at P. If PQ = 10 cm and PR = 24 cm, find QR.

P Q R

P

P Q, P R

Q R

P Q = 6 c m

Q R = 10 c m

P R = 8 c m

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