The area of a square is 42.25 cm². Find its perimeter (in cm).
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The side of a square will always be the square root of its area because,
area = side*side.
So, first we will find the square root of the given square.
√42.25.
this might look confusing but remove the decimal and try to find the root by prime factorisation.
so √4225 = 65.
and √42.25 = 6.5
Therefore, side of the given square is 6.5cm.
So perimeter = 4*side.
p=4*6.5
p=26cm.
Hence, perimeter = 26cm.
area = side*side.
So, first we will find the square root of the given square.
√42.25.
this might look confusing but remove the decimal and try to find the root by prime factorisation.
so √4225 = 65.
and √42.25 = 6.5
Therefore, side of the given square is 6.5cm.
So perimeter = 4*side.
p=4*6.5
p=26cm.
Hence, perimeter = 26cm.
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