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Question

Triangle PQR is right angled at P, if sides PQ and QR are 20 cm and 29 cm respectively, find the side PR.

A
1282 cm
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B
18 cm
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C
21 cm
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D
25 cm
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Solution

The correct option is C 21 cm
Given:
PQ = 20 cm
QR = 29 cm

Applying Pythagoras theorem:
QR2=PR2+PQ2
292=PR2+202
841=PR2+400
841400=PR2
441=PR2
PR=441
PR=21 cm

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