What is the area of a quarter circle with a radius of 8 cm?

The area of a quarter circle is $$A = \frac{1}{4}·π·8^2 = 16π ≈ 50.27 cm^2$$ .

If the area of a circle is 78.5 m², what is its radius?

To find the radius, use the formula $$A = π·r^2$$ . Thus, $$r = \frac{A}{π} = \frac{78.5}{π} ≈ 5 m$$ .

What is the relationship between diameter and circumference?

The circumference is directly proportional to the diameter, expressed as $$C = π·d$$ .

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

Use the formula $$C = π·d$$ to find the diameter, then use $$A = π·(\frac{d}{2})^2$$ to find the area.

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

The radius is 6 feet, so the area is $$A = π·6^2 = 36π ≈ 113.10 ft^2$$ .

What is the circumference of a circle with a diameter of 15 cm?

The circumference is $$C = π·15 ≈ 47.12 cm$$ .

If a circular garden has a radius of 10 meters, what is its area?

The area is $$A = π·10^2 = 100π ≈ 314.16 m^2$$ .

What is the area of a circle with a radius of 2.5 inches?

The area is $$A = π·(2.5)^2 = 6.25π ≈ 19.63 in^2$$ .

Circumference and Area of Circles Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

Tags

CCSS.7.G.B.4

2.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

Tags

CCSS.7.G.B.4

3.

FLASHCARD QUESTION

Front

If a circle has a diameter of 10 cm, what is its radius?

Back

The radius is half of the diameter, so the radius is 5 cm.

Tags

CCSS.7.G.B.4

4.

FLASHCARD QUESTION

Front

How do you convert diameter to radius?

Back

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

Tags

CCSS.7.G.B.4

5.

FLASHCARD QUESTION

Front

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

Back

Tags

CCSS.7.G.B.4

6.

FLASHCARD QUESTION

Front

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

Back

Tags

CCSS.7.G.B.4

7.

FLASHCARD QUESTION

Front

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

Back

Tags

CCSS.7.G.B.4

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