Question

the area of a square is 100 cm find the length of its sides and diagonal

Answer 1

${x}^{2} = 100 \\ \\ x = \sqrt{100} = 10 \\ \\ \: diagonal = \sqrt{2}x = 10 \sqrt{2} cm$
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Answer 2

According to Pythagoras thearm..


Diagonal(a) =root of sum of two sides here they are 10


Diagonal =root of[ 10+10]
=2root 5