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Question

A square park is surrounded by a path of uniform width 2 metre all around it. The area of the path is 288 sq. metres. Find the perimeter of the park

The correct answer is
136 m

Solving for the Square Park Perimeter Using Path Area

This problem involves finding the perimeter of a square park given the area of a path surrounding it and the path's uniform width. Let's break down the steps to find the solution.

Understanding the Geometry

We have a square park inside a larger square that includes the path.

  • Let the side length of the inner square park be '$s$' metres.
  • The path has a uniform width of 2 metres.
  • This means the side length of the larger square (park + path) is the side length of the park plus the width of the path on both sides.
  • Side length of the outer square = $s + 2 \times 2 = s + 4$ metres.

Formulating the Area Equation

The area of the path is the difference between the area of the outer square (park + path) and the area of the inner square park.

  • Area of the inner park = $s^2$ sq. metres.
  • Area of the outer square = $(s + 4)^2$ sq. metres.
  • Area of the path = Area of outer square - Area of inner park
  • We are given that the Area of the path is 288 sq. metres.
  • So, the equation is: $288 = (s + 4)^2 - s^2$.

Calculating the Side Length of the Park

Now, we solve the equation for '$s$':

  1. Expand the term $(s + 4)^2$: $(s + 4)^2 = s^2 + 2(s)(4) + 4^2 = s^2 + 8s + 16$.
  2. Substitute this back into the equation: $288 = (s^2 + 8s + 16) - s^2$.
  3. Simplify the equation: $288 = s^2 + 8s + 16 - s^2$.
  4. The '$s^2$' terms cancel out: $288 = 8s + 16$.
  5. Subtract 16 from both sides: $288 - 16 = 8s$.
  6. $272 = 8s$.
  7. Divide by 8 to find '$s$': $s = \frac{272}{8}$.
  8. $s = 34$ metres.

So, the side length of the square park is 34 metres.

Finding the Perimeter of the Park

The perimeter of a square is calculated by multiplying the side length by 4.

  • Perimeter = $4 \times s$
  • Perimeter = $4 \times 34$
  • Perimeter = $136$ metres.

Therefore, the perimeter of the park is 136 metres.

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Important Questions from Mensuration

  1. A solid cube is painted yellow, blue and black such that opposite faces are of same colour. The cube is then cut into 36 cubes of two different sizes such that 32 cubes are small and the other four cubes are Big. None of the faces of the bigger cubes is painted blue. How many cubes have only one face painted?

  2. A and B are two heavy steel blocks. If B is placed on the top of A, the weight increases by 60%. How much weight will reduce with respect to the total weight of A and B, if B is removed from the top of A?

  3. A gardener increased the area of his rectangular garden by increasing its length by 40% and decreasing its width by 20%. The area of the new garden

  4. A village having a population of 4000 requires 150 liters of water per head per day. It has a tank measuring 20 m x 15 m x 6 m. The water of this tank will last for

  5. The centroid of an equilateral triangle ABC is G. If AB is 6 cms, the length of AG is

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