Math Problem Statement

A circle is drawn inside a square so that the edge of the circle touches the midpoint of each side of the square. The radius of the circle is 62 cm. Calculate the total area of the four shaded sections. Give your answer in cm² to 1 d.p.

Solution

The image presents a problem where a circle is inscribed in a square, and the goal is to calculate the total area of the four shaded corner sections outside the circle but within the square. The radius of the circle is given as 62cm62 \, \text{cm}.

Let's break it down step by step:

Step 1: Calculate the side length of the square

Since the circle touches the midpoint of each side of the square, the diameter of the circle is equal to the side length of the square.

  • The diameter of the circle is twice the radius: Diameter of circle=2×62=124cm\text{Diameter of circle} = 2 \times 62 = 124 \, \text{cm} Thus, the side length of the square is also 124cm124 \, \text{cm}.

Step 2: Calculate the area of the square

The area AsA_s of a square is given by the formula: As=side length2A_s = \text{side length}^2 So, the area of the square is: As=1242=15376cm2A_s = 124^2 = 15376 \, \text{cm}^2

Step 3: Calculate the area of the circle

The area AcA_c of a circle is given by the formula: Ac=π×r2A_c = \pi \times r^2 where r=62cmr = 62 \, \text{cm}.

Ac=π×622=π×384412084.78cm2A_c = \pi \times 62^2 = \pi \times 3844 \approx 12084.78 \, \text{cm}^2

Step 4: Calculate the area of the shaded regions

The shaded regions are the parts of the square not occupied by the circle. The total area of the shaded regions is the difference between the area of the square and the area of the circle.

Area of shaded regions=AsAc\text{Area of shaded regions} = A_s - A_c Area of shaded regions=1537612084.783291.22cm2\text{Area of shaded regions} = 15376 - 12084.78 \approx 3291.22 \, \text{cm}^2

Final Answer:

The total area of the four shaded sections is approximately 3291.2cm23291.2 \, \text{cm}^2 (to 1 decimal place).

Would you like more details on any part of this solution? Here are some follow-up questions that might interest you:

  1. How is the relationship between the square's side length and the circle's diameter derived?
  2. Can this method be applied to other shapes (e.g., a triangle inscribed in a circle)?
  3. What if the radius of the circle was different? How would that affect the shaded area?
  4. How does changing the precision of π\pi affect the result?
  5. What happens to the shaded area if the circle does not perfectly touch the square's midpoint?

Tip: Always make sure to double-check units and rounding, especially when dealing with area or volume problems.

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Math Problem Analysis

Mathematical Concepts

Geometry
Circle
Square
Area Calculation

Formulas

Area of a square = side length²
Area of a circle = π × radius²
Total shaded area = Area of square - Area of circle

Theorems

Basic area formulas for squares and circles

Suitable Grade Level

Grades 9-11