In a right triangle PQR, ∠Q=90°. If PQ=20 cm and QR= 21 cm, then find the length of the side PR.
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Step-by-step explanation:
according to Pythagoras theorem
s^2+s^2=h^2
20*20+21*21=h^2
400+441=h^2
841=h^2
√841=PR
29=PR
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