Math Problem Statement

Calculate the area of the shaded polygon.

Solution

To calculate the area of the shaded polygon, we need to analyze the shape, which appears to be a combination of a triangle and a smaller rectangle. Here's the breakdown:

  1. Base of the large triangle = 14 cm
  2. Height of the large triangle = 8 cm
  3. Area of the large triangle = 12×base×height=12×14×8=56cm2\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 14 \times 8 = 56 \, \text{cm}^2

Now, subtract the area of the small rectangle from the area of the large triangle.

  1. Area of the small rectangle:

    • Width = 2 cm
    • Height = 3 cm
    • Area = 2×3=6cm22 \times 3 = 6 \, \text{cm}^2
  2. Area of the shaded region = Area of the large triangle - Area of the rectangle = 566=50cm256 - 6 = 50 \, \text{cm}^2.

So, the area of the shaded polygon is 50 cm².

Would you like further details or explanations on this problem? Here are some related questions:

  1. How would you calculate the area if the triangle had different dimensions?
  2. How would the area change if the smaller rectangle was larger or smaller?
  3. How can you calculate the perimeter of this shape?
  4. How do you calculate areas of irregular polygons using basic shapes?
  5. What are the differences in calculating area for composite shapes versus simple shapes?

Tip: When dealing with composite shapes, break them down into simpler shapes (like triangles, rectangles, or circles) to make the area calculation easier.

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Math Problem Analysis

Mathematical Concepts

Geometry
Area of Triangles
Area of Rectangles
Composite Shapes

Formulas

Area of a triangle: (1/2) × base × height
Area of a rectangle: width × height

Theorems

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Suitable Grade Level

Grades 6-8