Calculating Areas of Composite Figures

This video tutorial from MooMoo Math and Science explains how to find the area of composite figures. It covers calculating the area of rectangles and semicircles, and how to subtract the semicircle area from the rectangle area to find the total area of the composite figure. The video includes two examples to illustrate the process.

What is the first step in finding the area of a composite figure?

• Calculate the perimeter

• Find the volume

• Identify the shapes involved

• Measure the angles

How do you calculate the area of a rectangle?

• Length divided by width

• Length plus width

• Length times width

• Length minus width

What is the formula for the area of a semicircle?

• Pi times radius

• Half of pi times radius squared

• Pi times radius squared

• Pi times diameter squared

What is the radius if the diameter of a semicircle is 6 cm?

• 12 cm

• 6 cm

• 3 cm

• 9 cm

After calculating the areas of individual shapes, what is the next step?

• Multiply the areas

• Divide the areas

• Subtract the areas

• Add the areas together

In the second example, what shapes are involved?

• A triangle and a rectangle

• Two semicircles and a rectangle

• Two rectangles and a circle

• A square and a semicircle

What is the area of a rectangle with dimensions 8 cm by 4 cm?

• 12 cm²

• 24 cm²

• 32 cm²

• 40 cm²

How do you adjust the semicircle area calculation when there are two semicircles?

• Divide by 2

• Add 2

• Subtract 2

• Multiply by 2

What is the final step in finding the area of the composite figure in the second example?

• Multiply the areas of the semicircles

• Subtract the area of the semicircles from the rectangle

• Add the areas of the semicircles

• Divide the area of the rectangle by the semicircles

What is the total area of the composite figure in the second example?

• 57.7 cm²

• 12.56 cm²

• 32 cm²

• 19.44 cm²