If the area of a circle is 50π square meters, what is the radius?

Using the area formula, set $$50\text{π} = r^2 \times \text{π}$$ . Thus, $$r^2 = 50$$ , so $$r = \text{√}50 \text{ meters}$$ .

What is the area of a circle with a radius of 4 inches?

Using the formula $$A = r^2 \times \text{π}$$ , the area is $$A = 4^2 \times \text{π} = 16\text{π}$$ square inches.

How do you convert the area of a circle from square units to terms of pi?

To convert, divide the area by π. For example, if the area is 36 square units, then in terms of pi, it is $$\frac{36}{\text{π}}$$ .

What is the area of a circle with a diameter of 12 feet?

First, find the radius: $$r = \frac{12}{2} = 6$$ feet. Then, use the area formula: $$A = 6^2 \times \text{π} = 36\text{π}$$ square feet.

If a circle has an area of 81π square inches, what is its diameter?

Using the area formula, set $$81\text{π} = r^2 \times \text{π}$$ . Thus, $$r^2 = 81$$ , so $$r = 9$$ inches. The diameter is $$d = 2r = 18$$ inches.

What is the area of a circle with a radius of 3 cm?

Using the formula $$A = r^2 \times \text{π}$$ , the area is $$A = 3^2 \times \text{π} = 9\text{π}$$ square centimeters.

How do you find the area of a circle if only the diameter is known?

Use the formula: $$A = \frac{1}{4} \times d^2 \times \text{π}$$ , where d is the diameter.

2d Geometry: 2A Area Flashcards

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14 questions

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1.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

2.

FLASHCARD QUESTION

Front

How do you express the area of a circle in terms of pi?

Back

3.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

4.

FLASHCARD QUESTION

Front

If the radius of a circle is 5 inches, what is its area?

Back

5.

FLASHCARD QUESTION

Front

What is the area of a circle with a diameter of 10 feet?

Back

6.

FLASHCARD QUESTION

Front

How do you calculate the area of a circle if the diameter is given?

Back

7.

FLASHCARD QUESTION

Front

What is the area of a circle with a radius of 6 cm?

Back

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