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

The area is $$A = \text{π}(3^2) = 9\text{π} \text{ in}^2 \text{ (approximately 28.27 in}^2)$$ .

What is the circumference of a circle with a radius of 4 cm?

The circumference is $$C = 2\text{π}(4) = 8\text{π} \text{ cm} \text{ (approximately 25.13 cm)}$$ .

What is the diameter of a circle with a radius of 5 m?

The diameter is $$d = 2r = 2(5) = 10 \text{ m}$$ .

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

Using the area formula, $$A = \text{π}r^2$$ , solve for r: $$r = \frac{50}{\text{π}} \text{ (approximately 8.86 cm)}$$ .

What is the circumference of a circle with a radius of 6 inches?

The circumference is $$C = 2\text{π}(6) = 12\text{π} \text{ inches} \text{ (approximately 37.70 inches)}$$ .

What is the area of a circle with a diameter of 8 cm?

The radius is 4 cm, so the area is $$A = \text{π}(4^2) = 16\text{π} \text{ cm}^2 \text{ (approximately 50.27 cm}^2)$$ .

What is the formula to convert circumference to radius?

To find the radius from the circumference, use $$r = \frac{C}{2\text{π}}$$ .

Resource Library

Math

Geometry

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Area And Circumference Of A Circle

Area and Circumference of a Circle

Flashcard

•

Mathematics

•

9th Grade

•

Practice Problem

•

Hard

•

CCSS

7.G.B.4, 8.EE.A.2

Standards-aligned

Wayground Content

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15 questions

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FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

If the radius of a circle is 7 cm, what is its area?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

If the circumference of a circle is 31.4 cm, what is the radius?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

What is the circumference of a circle with a diameter of 10 inches?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

How do you find the radius if you know the area of the circle?

Back

Tags

CCSS.7.G.B.4

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