Math Problem Statement

Find the area of the following composite figure: A trapezoid made up of a rectangle and two right triangles, with dimensions 27 ft (rectangle base), 11 ft (rectangle height), 7 ft (triangle base), and 13 ft (triangle height).

Solution

The problem asks for the area of a composite figure, which is made up of a rectangle and two right triangles. Here's how we can solve it:

Step-by-Step Solution:

  1. Area of the rectangle:

    • The dimensions of the rectangle are given as 27ft×11ft27 \, \text{ft} \times 11 \, \text{ft}.
    • The area ArectA_{\text{rect}} is calculated by multiplying the base by the height: Arect=27ft×11ft=297square feetA_{\text{rect}} = 27 \, \text{ft} \times 11 \, \text{ft} = 297 \, \text{square feet}
  2. Area of the two right triangles:

    • Each triangle has a base of 7ft7 \, \text{ft} and a height of 13ft11ft=2ft13 \, \text{ft} - 11 \, \text{ft} = 2 \, \text{ft}.
    • The area of one triangle AtriA_{\text{tri}} is: Atri=12×7ft×2ft=7square feetA_{\text{tri}} = \frac{1}{2} \times 7 \, \text{ft} \times 2 \, \text{ft} = 7 \, \text{square feet}
    • Since there are two triangles, the total area of the triangles is: Atotal triangles=2×7square feet=14square feetA_{\text{total triangles}} = 2 \times 7 \, \text{square feet} = 14 \, \text{square feet}
  3. Total area of the composite figure:

    • Now, add the areas of the rectangle and the two triangles: Atotal=297square feet+14square feet=311square feetA_{\text{total}} = 297 \, \text{square feet} + 14 \, \text{square feet} = 311 \, \text{square feet}

Final Answer:

The area of the composite figure is 311square feet311 \, \text{square feet}.

Would you like more details or have any questions?

Here are some related questions you might find helpful:

  1. How do you calculate the area of irregular shapes?
  2. What is the formula for the area of a trapezoid?
  3. How do you break down composite figures into simpler shapes?
  4. How do you determine the height of a right triangle in composite shapes?
  5. How would the area change if the dimensions of the rectangle were different?

Tip: Always ensure the units of measurement are consistent when calculating areas or perimeters.

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Math Problem Analysis

Mathematical Concepts

Geometry
Area of Composite Figures
Right Triangles
Rectangles

Formulas

Area of rectangle = base × height
Area of triangle = 1/2 × base × height

Theorems

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Suitable Grade Level

Grades 6-8