find the digonal of a squre whose digonal is 10 cm.
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The side of square is 10 cm
In right angled △ABD
AB 2 +AD2 =BD2 [according to Pythagoras theorem]
(10)2 +(10)2 =BD2$
100+100=BD2
BD2 =200
BD=10√2 cm
∴ Diagonal of square =10√2 cm.
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