1. The radius of a circle with a diameter of 20 units is 10 units. The formula for the area of a circle is A = πr^2, so the area of this circle would be A = π(10)^2 which simplifies to A = 100π square units.
2. The radius of a circle with a diameter of 12 cm is 6 cm. Using the formula A = πr^2, the area of this circle would be A = π(6)^2 which simplifies to A = 36π square cm.
3. The radius of a circle with a diameter of 15 ft is 7.5 ft. Using the formula A = πr^2, the area of this circle would be A = π(7.5)^2 which simplifies to A = 56.25π square ft.
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Answer:
1. The radius of a circle with a diameter of 20 units is 10 units. The formula for the area of a circle is A = πr^2, so the area of this circle would be A = π(10)^2 which simplifies to A = 100π square units.
2. The radius of a circle with a diameter of 12 cm is 6 cm. Using the formula A = πr^2, the area of this circle would be A = π(6)^2 which simplifies to A = 36π square cm.
3. The radius of a circle with a diameter of 15 ft is 7.5 ft. Using the formula A = πr^2, the area of this circle would be A = π(7.5)^2 which simplifies to A = 56.25π square ft.
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