Math Problem Statement

What is the area of this figure? (The figure is a complex shape made up of two rectangles, one trapezoid, and one triangle, with given dimensions.)

Solution

To find the area of this irregular figure, we can break it down into smaller, manageable shapes (rectangles and triangles). Let's proceed step by step:

Step 1: Break down the figure

The figure consists of:

  1. A rectangle on the far right.
  2. A trapezoid in the middle.
  3. Another rectangle at the bottom left.
  4. A triangle on the top left.

Step 2: Calculate the area of each shape

1. Right Rectangle:

  • Dimensions: 4 inches (width) × 8 inches (height)
  • Area: 4×8=32square inches4 \times 8 = 32 \, \text{square inches}

2. Middle Trapezoid:

  • The height is 5 inches (given).
  • The two parallel sides are 1 inch (top) and 5 inches (bottom).
  • Area of trapezoid formula: Area=12×(Base1+Base2)×Height\text{Area} = \frac{1}{2} \times (\text{Base}_1 + \text{Base}_2) \times \text{Height} Substituting the values: Area=12×(1+5)×5=12×6×5=15square inches\text{Area} = \frac{1}{2} \times (1 + 5) \times 5 = \frac{1}{2} \times 6 \times 5 = 15 \, \text{square inches}

3. Bottom Left Rectangle:

  • Dimensions: 5 inches (width) × 2 inches (height)
  • Area: 5×2=10square inches5 \times 2 = 10 \, \text{square inches}

4. Top Left Triangle:

  • Base: 3 inches
  • Height: 2 inches
  • Area of triangle formula: Area=12×Base×Height\text{Area} = \frac{1}{2} \times \text{Base} \times \text{Height} Substituting the values: Area=12×3×2=3square inches\text{Area} = \frac{1}{2} \times 3 \times 2 = 3 \, \text{square inches}

Step 3: Total Area

Now, add up the areas of all the parts: Total Area=32+15+10+3=60square inches\text{Total Area} = 32 + 15 + 10 + 3 = 60 \, \text{square inches}

Final Answer:

The area of the figure is 60 square inches.

Would you like more details or clarifications? Here are some related questions to further your understanding:

  1. How do you find the area of a trapezoid in general?
  2. Can the area of an irregular shape always be broken into simpler parts?
  3. What are the differences in calculating the area of polygons versus circles?
  4. How would you calculate the area of a 3D object like a prism?
  5. How does the concept of area extend to integration in calculus?

Tip: Always verify the breakdown of complex shapes by rechecking the dimensions and shape types before calculating the area.

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Math Problem Analysis

Mathematical Concepts

Geometry
Area Calculation
Irregular Shapes

Formulas

Area of a rectangle: width × height
Area of a trapezoid: (1/2) × (Base1 + Base2) × height
Area of a triangle: (1/2) × base × height

Theorems

Basic area calculation for geometric shapes

Suitable Grade Level

Grades 6-8