Mathematics
Grade10
Easy

Question

Suppose the area of a square is 84 sq.cm, find the side length.

  1. square root of 21
  2. 4 square root of 21
  3. 2 square root of 21
  4. square root of 22

Hint:

A square is a rectangle whose all the sides are equal.

The correct answer is: 2 square root of 21


    We are given the area of a square is 84 sq. cm. We have to find the side length.
    We have,
    Area of a square = 84 cm².
    => (side)² = 84
    => side = √84
    => side = 2√21 cm.
    Hence, the correct option is C.

    Area of a rectangle is length × breadth. Since, for a square both length and breadth are equal so its area is (side)².

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