How do you convert diameter to radius?

To convert diameter to radius, divide the diameter by 2: $$r = \frac{d}{2}$$ .

What is the circumference of a circle with a radius of 5 inches?

Using the formula C = $$2 \times \text{π} \times r$$ , the circumference is C = $$2 \times 3.14 \times 5 = 31.4 \text{ in}$$ .

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

Using the formula A = $$\text{π} \times r^2$$ , first find the radius: r = 6 inches. Then, A = $$3.14 \times 6^2 = 113.04 \text{ in}^2$$ .

What is the relationship between the diameter and circumference of a circle?

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

If a circle has an area of 78.5 square inches, what is its radius?

Using the formula A = $$\text{π} \times r^2$$ , solve for r: r = @@rac{A}{ ext{π}} = rac{78.5}{3.14} ightarrow r ext{ is approximately } 5 ext{ in}@@.

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

Using the formula C = $$\text{π} \times d$$ , the circumference is C = $$3.14 \times 10 = 31.4 \text{ ft}$$ .

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

Using the formula A = $$\text{π} \times r^2$$ , the area is A = $$3.14 \times 4^2 = 50.24 \text{ in}^2$$ .

What does 'circumference' mean?

Circumference is the distance around the circle.

CIRCUMFERENCE+AREA OF A CIRCLE 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

What does the term 'diameter' mean in relation to a circle?

Back

The diameter is the distance across the circle, passing through the center. It is twice the length of the radius.

Tags

CCSS.HSG.C.A.2

4.

FLASHCARD QUESTION

Front

What does the term 'radius' mean in relation to a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

5.

FLASHCARD QUESTION

Front

If the radius of a circle is 10 inches, what is the area?

Back

Tags

CCSS.7.G.B.4

6.

FLASHCARD QUESTION

Front

If the diameter of a circle is 20 inches, what is the circumference?

Back

Tags

CCSS.7.G.B.4

7.

FLASHCARD QUESTION

Front

What is the value of π (pi) used in calculations?

Back

The value of π (pi) is approximately 3.14, but it is an irrational number and its decimal representation goes on infinitely.

Tags

CCSS.8.EE.A.4

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