Math Problem Statement

What is the area of this shape?

What is the area of this shape?

Solution

To determine the area of this shape, we must break it into simpler components. This composite figure consists of:

  1. A rectangle: Dimensions are 4m×6m4 \, \text{m} \times 6 \, \text{m}.
  2. A semicircle: Diameter is 4m4 \, \text{m}, so the radius is 2m2 \, \text{m}.
  3. A right triangle: Base is 7m7 \, \text{m} and height is 2m2 \, \text{m}.

Calculations:

  1. Area of the rectangle: Area=length×width=4×6=24m2\text{Area} = \text{length} \times \text{width} = 4 \times 6 = 24 \, \text{m}^2

  2. Area of the semicircle: Area=12πr2=12π(22)=12π(4)=2πm2\text{Area} = \frac{1}{2} \pi r^2 = \frac{1}{2} \pi (2^2) = \frac{1}{2} \pi (4) = 2\pi \, \text{m}^2 Using π3.14\pi \approx 3.14: Area2×3.14=6.28m2\text{Area} \approx 2 \times 3.14 = 6.28 \, \text{m}^2

  3. Area of the triangle: Area=12×base×height=12×7×2=7m2\text{Area} = \frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 7 \times 2 = 7 \, \text{m}^2

  4. Total Area: Adding these together: Total Area=Area of rectangle+Area of semicircle+Area of triangle\text{Total Area} = \text{Area of rectangle} + \text{Area of semicircle} + \text{Area of triangle} Total Area=24+6.28+7=37.28m2\text{Total Area} = 24 + 6.28 + 7 = 37.28 \, \text{m}^2

Final Answer:

The total area of the shape is approximately: 37.28m2\boxed{37.28 \, \text{m}^2}

Let me know if you want detailed steps for a specific part!
Here are some related questions to consider:

  1. How would the total area change if the semicircle were a full circle?
  2. What is the perimeter of the given shape?
  3. How would you compute the area if the dimensions were doubled?
  4. Can this shape be divided differently to simplify calculations?
  5. What happens to the semicircle’s area if the radius is halved?

Tip: Always double-check the units in your calculations to ensure they are consistent throughout!

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Math Problem Analysis

Mathematical Concepts

Geometry
Area of composite shapes
Area of a rectangle
Area of a semicircle
Area of a triangle

Formulas

Area of a rectangle = length × width
Area of a semicircle = (1/2) × π × radius^2
Area of a triangle = (1/2) × base × height

Theorems

Pythagorean theorem (implicitly for triangles)

Suitable Grade Level

Grades 7-9