Area of a Semicircle Worksheet
Calculate the area of semicircles given various dimensions, including diameter and radius, at a Grade 12 level.
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Area of a Semicircle
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Read each question carefully and calculate the area of the semicircle. Use π ≈ 3.14 and round your answers to two decimal places where necessary.
1. Find the area of a semicircle with a radius of 7 cm.
2. A semicircle has a diameter of 18 meters. Calculate its area.
3. The formula for the area of a semicircle is .
4. If the radius of a semicircle is 10 inches, its area is approximately square inches.
5. A semicircle with a diameter of 20 mm has a radius of mm.
6. Which of the following best approximates the area of a semicircle with a radius of 5 cm?
39.27 cm²
78.54 cm²
157.08 cm²
19.63 cm²
7. If the area of a semicircle is 28.26 square units, what is its approximate radius?
3 units
6 units
9 units
18 units
8. The area of a semicircle is exactly half the area of a full circle with the same radius.
True
False
9. Doubling the radius of a semicircle will double its area.
True
False
10. A circular pizza with a diameter of 16 inches is cut in half. What is the area of one of the semicircular pieces?