What is the circumference of a circle with a radius of 3? Use 3.14 for $$\text{π}$$ .

The circumference is 18.84, calculated as C = $$2 \times \text{π} \times r = 2 \times 3.14 \times 3$$ .

What is the circumference of a circle with a diameter of 5? Use 3.14 for $$\text{π}$$ .

The circumference is 15.7, calculated as C = $$\text{π} \times d = 3.14 \times 5$$ .

What is the area of a circle with a radius of 2? Use 3.14 for $$\text{π}$$ .

The area is 12.56, calculated as A = $$\text{π} \times r^2 = 3.14 \times 2^2$$ .

What is the distance around a circle called?

The distance around a circle is called the circumference.

If the radius of a circle is doubled, what happens to the area?

If the radius is doubled, the area increases by a factor of four, since A = $$\text{π} \times (2r)^2 = 4 \times \text{π} \times r^2$$ .

What is the diameter of a circle with a circumference of 31.4? Use 3.14 for $$\text{π}$$ .

The diameter is 10, calculated as d = $$\frac{C}{\text{π}} = \frac{31.4}{3.14}$$ .

What is the radius of a circle with an area of 28.26? Use 3.14 for $$\text{π}$$ .

The radius is 3, calculated as r = $$\text{√}\frac{A}{\text{π}} = \text{√}\frac{28.26}{3.14}$$ .

What is the relationship between circumference and radius?

The circumference is directly proportional to the radius, expressed as C = $$2 \times \text{π} \times r$$ .

What happens to the circumference if the diameter is halved?

If the diameter is halved, the circumference is also halved, since C = $$\text{π} \times d$$ .

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Math

Geometry

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Circle: Circumference And Area

Circle: Circumference and Area

Flashcard

•

Mathematics

•

10th Grade

•

Practice Problem

•

Hard

•

CCSS

7.G.B.4

Standards-aligned

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FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

Tags

CCSS.7.G.B.4

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 relationship between diameter and radius?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

If the diameter of a circle is 10, what is the radius?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

What is the diameter of a circle with a radius of 4?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

Back

Tags

CCSS.7.G.B.4

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