How do you calculate the radius if you know the diameter?

The radius is half of the diameter.

What is the relationship between the radius and diameter?

The diameter is twice the radius.

What is the formula for circumference using diameter?

The formula is $$C = \text{π}d$$ .

If the radius of a circle is 10 yards, what is the circumference?

The circumference is $$C = 2\text{π}(10) = 20\text{π}$$ yards.

What does the symbol π represent in mathematics?

The symbol π represents the ratio of the circumference of a circle to its diameter.

What is the relationship between circumference and radius?

The circumference can be calculated using the formula $$C = 2\text{π}r$$ .

Ratio and Pi Flashcards

Student preview

15 questions

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1.

FLASHCARD QUESTION

Front

If the diameter of a circle is 50 yards, what is the radius?

Back

The radius is 25 yards.

Tags

CCSS.7.G.B.4

2.

FLASHCARD QUESTION

Front

What is the value of pi?

Back

Pi is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

3.

FLASHCARD QUESTION

Front

What is the equation that represents the relationship between the circumference (C) and the diameter (d) of a circle?

Back

Tags

CCSS.7.G.B.4

4.

FLASHCARD QUESTION

Front

What formula do we use to find the circumference of a circle when given the radius?

Back

Tags

CCSS.7.G.B.4

5.

FLASHCARD QUESTION

Front

What is twice the radius of a circle called?

Back

It is called the diameter.

Tags

CCSS.HSG.C.A.2

6.

FLASHCARD QUESTION

Front

Define circumference in relation to a circle.

Back

Circumference is the distance around a circle.

7.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

Tags

CCSS.7.G.B.4

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