If a circle has an area of 50 cm², what is the radius?

To find the radius, use the formula: $$r = \text{√}\frac{A}{\text{π}}$$ . So, $$r = \text{√}\frac{50}{\text{π}} \text{ cm}$$ .

What is the area of a circle with a radius of 3.5 m?

The area is $$A = \text{π} \times (3.5)^2 = 38.48 \text{ m}^2$$ .

What is the area of a circle with a radius of 12 inches?

The area is $$A = \text{π} \times (12)^2 = 452.39 \text{ in}^2$$ .

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

First, divide the diameter by 2 to find the radius, then use the formula $$A = \text{π} \times r^2$$ .

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

The area is $$A = \text{π} \times (4)^2 = 50.27 \text{ ft}^2$$ .

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 4, since area is proportional to the square of the radius.

What is the area of a circle with a radius of 1 cm?

The area is $$A = \text{π} \times (1)^2 = 3.14 \text{ cm}^2$$ .

What is the area of a circle with a radius of 15 m?

The area is $$A = \text{π} \times (15)^2 = 706.86 \text{ m}^2$$ .

Area of Circles Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the formula to calculate the area of a circle?

Back

2.

FLASHCARD QUESTION

Front

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

Back

3.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

The radius is half of the diameter. To find the radius, divide the diameter by 2.

4.

FLASHCARD QUESTION

Front

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2.

5.

FLASHCARD QUESTION

Front

What is the area of a circle with a diameter of 14 cm?

Back

6.

FLASHCARD QUESTION

Front

What is the area of a circle with a radius of 9.2 cm?

Back

7.

FLASHCARD QUESTION

Front

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

Back

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