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Question

Calculate the length of the diagonal of a square if the area of the square is 32 cm\(^2\).

This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is
8 cm

Diagonal Length Calculation for Square Area

The problem asks us to find the length of the diagonal of a square given its area. We are given the area of the square is \(32\) cm\(^2\).

Finding the Side Length

The formula for the area (\(A\)) of a square with side length (\(s\)) is \(A = s^2\). We can use the given area to find the side length:

\(s^2 = 32 \, \text{cm}^2\)

To find \(s\), we take the square root of both sides:

\(s = \sqrt{32} \, \text{cm}\)

Simplify the square root:

\(s = \sqrt{16 \times 2} \, \text{cm} = 4\sqrt{2} \, \text{cm}\)

Calculating the Diagonal Length

The relationship between the side length (\(s\)) and the diagonal (\(d\)) of a square is given by the Pythagorean theorem, which simplifies to \(d = s\sqrt{2}\).

Now, substitute the calculated side length (\(s = 4\sqrt{2}\) cm) into the diagonal formula:

\(d = (4\sqrt{2}) \times \sqrt{2} \, \text{cm}\)

\(d = 4 \times (\sqrt{2} \times \sqrt{2}) \, \text{cm}\)

\(d = 4 \times 2 \, \text{cm}\)

\(d = 8 \, \text{cm}\)

Therefore, the length of the diagonal of the square is \(8\) cm.

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Similar Questions

  1. What is the area of a square whose diagonal measures 4 cm?
  2. A farmer wants to fence his rectangular field of length 200 m and area 3000 \(\text{m}^2\). If the cost of fencing per metre is 5 rupees, what is the total cost of fencing in rupees?
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Important Questions from 2-D Mensuration

  1. The length of a rectangular plot is $(x^2 + xy + y^2)$ m and its breadth is $(x^2 - 5xy - y^2)$ m.
    Find its perimeter, when $x = 1$ and $y = -1$.
  2. The ratio between the perimeter and breadth of a rectangle is 3: 1. If the area of the rectangle is $98 \text{ cm}^2$, find the perimeter (in cm) of the rectangle.
  3. The shorter side of a rectangle is 15 cm less than the longer side. The numerical value of its area is equal to 5 times the numerical value of its perimeter. What is the length (in cm) of its longer side?

  4. In a circle of radius 10.5 cm, if the angle of a sector is $\frac{2\pi}{3}$, then the perimeter of the sector is (in cm):
    (Take $\pi = \frac{22}{7}$)
  5. Find the circumference (in m) of the largest circle that can be inscribed in a rectangle whose dimensions are given as 114 m and 63 m.
    Take $\pi = \frac{22}{7}$
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