If a circle has an area of 254.3 in², what is its radius?

Using the area formula, $$A = \text{π}r^2$$ , we can solve for r: $$r = \frac{A}{\text{π}} = \frac{254.3}{\text{π}}$$ .

What is the area of a circle with a radius of 9 cm?

Using the formula $$A = \text{π}r^2$$ , the area is $$A = \text{π}(9)^2 = 81\text{π} \text{ cm}^2$$ .

How do you find the area of a circle if only the circumference is given?

First, find the radius from the circumference using $$C = 2\text{π}r$$ , then use the area formula $$A = \text{π}r^2$$ .

What is the area of a circle with a radius of 10 inches?

Using the formula $$A = \text{π}r^2$$ , the area is $$A = \text{π}(10)^2 = 100\text{π} \text{ in}^2$$ .

What is the area of a circle with a radius of 5 meters?

Using the formula $$A = \text{π}r^2$$ , the area is $$A = \text{π}(5)^2 = 25\text{π} \text{ m}^2$$ .

If the radius of a circle is doubled, how does the area change?

If the radius is doubled, the area increases by a factor of four, since area is proportional to the square of the radius.

What is the area of a circle with a radius of 7 cm?

Using the formula $$A = \text{π}r^2$$ , the area is $$A = \text{π}(7)^2 = 49\text{π} \text{ cm}^2$$ .

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

If the radius of a circle is 4 cm, what is its area?

Back

3.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

4.

FLASHCARD QUESTION

Front

How do you convert diameter to radius?

Back

5.

FLASHCARD QUESTION

Front

What is the area of a circle with a diameter of 30 feet?

Back

6.

FLASHCARD QUESTION

Front

What does π (pi) represent in geometry?

Back

π (pi) is a constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

7.

FLASHCARD QUESTION

Front

What is the area of a circle expressed in terms of π?

Back

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