length of diagonal of a square whose area is 196m² is _____
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Area of the square =a² sq.units
196=a²
√a²=√196
a=14cm
Diagonal of the square=a√2 cm
=14√2
=14×1.414
=19.796
=19.8cm
Therefore,the diagonal of the square is 14√2 cm or 19.8 cm.