Math Problem Statement

Find the area enclosed by the figure. Use 3.14 for π and do not round your answer. (The figure is not to scale).

Solution

To solve this, let’s divide the shape into two parts: a rectangle and a half-circle, then add the areas of each.

  1. Rectangle Area:

    • The rectangle's dimensions are 7 cm (length) and 6 cm (height).
    • Area of rectangle = length × height = 7cm×6cm=42cm27 \, \text{cm} \times 6 \, \text{cm} = 42 \, \text{cm}^2.
  2. Half-Circle Area:

    • The half-circle’s diameter is the same as the rectangle's height, which is 6 cm. Thus, the radius r=6cm2=3cmr = \frac{6 \, \text{cm}}{2} = 3 \, \text{cm}.
    • Area of a full circle = πr2\pi r^2.
    • For the half-circle, Area = 12πr2\frac{1}{2} \pi r^2.
    • Substitute π=3.14\pi = 3.14 and r=3cmr = 3 \, \text{cm}: Half-circle Area=12×3.14×(3)2=12×3.14×9=14.13cm2\text{Half-circle Area} = \frac{1}{2} \times 3.14 \times (3)^2 = \frac{1}{2} \times 3.14 \times 9 = 14.13 \, \text{cm}^2
  3. Total Area:

    • Add the area of the rectangle and the half-circle: Total Area=42cm2+14.13cm2=56.13cm2\text{Total Area} = 42 \, \text{cm}^2 + 14.13 \, \text{cm}^2 = 56.13 \, \text{cm}^2

Answer: 56.13cm256.13 \, \text{cm}^2.

Would you like a further breakdown of any part of this solution?


Here are related questions you might find useful:

  1. What would the area be if the half-circle were a full circle?
  2. How would the area change if the diameter of the half-circle was 8 cm?
  3. What is the perimeter of this shape?
  4. How does using a more accurate value of π\pi (like 3.14159) affect the area calculation?
  5. How can we find the area if the shape was scaled by a factor of 2?

Tip: When dealing with composite shapes, breaking them into simpler parts often makes area calculations easier.

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Math Problem Analysis

Mathematical Concepts

Geometry
Area Calculation
Composite Shapes

Formulas

Area of rectangle = length × width
Area of a circle = π × r^2
Area of a half-circle = (1/2) × π × r^2

Theorems

Area Addition of Composite Shapes

Suitable Grade Level

Grades 7-9