In a triangle pqr, pq = pr = 11 cm and s is a point on qr such that ps = 10 cm. If the lengths of qs and sr, when expressed in cm, are integers, then find the length of qr.
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By using Pythagoras theorem
hypotenuse=Base×height
pq²=qs²+ps²
11²=qs²+10²
121=qs²+100
qs²=121-100
qs²=21
qs=√21
qs=4.5825
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