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How do you calculate the area of a compound shape with a square and a triangle?

To calculate the area of a compound shape consisting of a square and a triangle, we need to find the areas of both individual shapes and sum them together.

Understanding Compound Shapes

A compound shape is formed by combining two or more simple geometric figures. In this example, we will work with a square and a triangle. To determine the total area of the compound shape, we will first compute the area of each shape separately.

Area of the Square

The area of a square is calculated using the formula:

Area of square=side length×side length\text{Area of square} = \text{side length} \times \text{side length}

If we denote the side length of the square as ss, then the area can be expressed as:

Area of square=s2\text{Area of square} = s^2

Area of the Triangle

The area of a triangle is determined using the formula:

Area of triangle=12×base×height\text{Area of triangle} = \frac{1}{2} \times \text{base} \times \text{height}

For a triangle with a base bb and a height hh, the area can be calculated as:

Area of triangle=12×b×h\text{Area of triangle} = \frac{1}{2} \times b \times h

Calculating the Total Area

After calculating the areas of both shapes, we can find the total area of the compound shape by adding them together:

Total area=Area of square+Area of triangle\text{Total area} = \text{Area of square} + \text{Area of triangle}

Example Calculation

Let’s illustrate this with an example. Suppose the side length of the square is 4cm4 \, \text{cm}, the base of the triangle is 4cm4 \, \text{cm}, and the height of the triangle is 3cm3 \, \text{cm}. We can compute the areas as follows:

  1. Area of the square:

    Area of square=4×4=16cm2\text{Area of square} = 4 \times 4 = 16 \, \text{cm}^2
  2. Area of the triangle:

    Area of triangle=12×4×3=6cm2\text{Area of triangle} = \frac{1}{2} \times 4 \times 3 = 6 \, \text{cm}^2
  3. Total area of the compound shape:

    Total area=16cm2+6cm2=22cm2\text{Total area} = 16 \, \text{cm}^2 + 6 \, \text{cm}^2 = 22 \, \text{cm}^2

Conclusion

By summing the areas of the square and the triangle, we find that the total area of the compound shape is 22cm222 \, \text{cm}^2. This method of breaking down the problem into simpler components allows for a straightforward calculation of compound shapes.

Answered by: Dr. Angela Davis
GCSE Maths Tutor
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