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Find the area of the circle

Two semicircles are used to make the shaded shape below.
One semicircle has a diameter of 12 cm and the other has a diameter of 20 cm.
Work out the area of the shaded shape.

Find the area of the circle Two semicircles are used to make the shaded shape below-example-1
User Pedro Vaz
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1 Answer

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Answer:

To find the area of the shaded shape, we need to find the area of each of the semicircles and then add them together.

The area of a circle is given by the formula:

area = pi * r^2

Where r is the radius of the circle.

The radius of a circle is half the diameter, so the radius of the smaller semicircle is 6 cm and the radius of the larger semicircle is 10 cm.

Plugging these values into the formula, we get:

Area of smaller semicircle = pi * 6^2 = 36 * pi cm^2 Area of larger semicircle = pi * 10^2 = 100 * pi cm^2

To find the total area of the shaded shape, we need to add these two areas together:

Total area = 36 * pi cm^2 + 100 * pi cm^2 = 136 * pi cm^2

The final answer is 136 * pi cm^2.

User Tarsem Singh
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