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A wire, when bent in the form of a squar...

A wire, when bent in the form of a square, encloses an area of 484 `cm^(2)`. Find :
(i) one side of the square
(ii) length of the wire
(iii) the largest area enclosed, if the same wire is bent to form a circle.

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The correct Answer is:
To solve the problem step by step, we will break it down into three parts as stated in the question. ### Step 1: Find one side of the square. Given that the area of the square is 484 cm², we can use the formula for the area of a square: \[ \text{Area} = \text{side}^2 \] Let the side of the square be \( a \). Therefore, we have: \[ a^2 = 484 \] To find \( a \), we take the square root of both sides: \[ a = \sqrt{484} = 22 \text{ cm} \] ### Step 2: Find the length of the wire. The length of the wire is equal to the perimeter of the square. The formula for the perimeter \( P \) of a square is: \[ P = 4 \times \text{side} \] Substituting the value of the side we found: \[ P = 4 \times 22 = 88 \text{ cm} \] ### Step 3: Find the largest area enclosed if the same wire is bent to form a circle. When the wire is bent into a circle, the length of the wire becomes the circumference of the circle. The formula for the circumference \( C \) of a circle is: \[ C = 2\pi r \] Setting the circumference equal to the perimeter of the square: \[ 2\pi r = 88 \] To find the radius \( r \), we rearrange the equation: \[ r = \frac{88}{2\pi} = \frac{44}{\pi} \] Now, we can find the area \( A \) of the circle using the formula: \[ A = \pi r^2 \] Substituting the value of \( r \): \[ A = \pi \left(\frac{44}{\pi}\right)^2 = \pi \cdot \frac{1936}{\pi^2} = \frac{1936}{\pi} \] Using \( \pi \approx \frac{22}{7} \): \[ A \approx \frac{1936 \times 7}{22} = 616 \text{ cm}^2 \] ### Summary of Answers: 1. One side of the square: **22 cm** 2. Length of the wire: **88 cm** 3. Largest area enclosed when bent into a circle: **616 cm²**
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ICSE-AREA OF A TRAPEZIUM AND A POLYGON-EXERCISE 20(D)
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