What is the relationship between diameter and radius?

The diameter is twice the radius.

What does the term 'pi' represent in circle calculations?

Pi (π) is a constant approximately equal to 3.14, representing the ratio of the circumference to the diameter.

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

A = $$\pi (7)^2 = 49\pi \approx 153.94 cm^2$$ .

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

r = $$\frac{31.4}{2\pi} \approx 5 cm$$ .

area and circumference of a circle Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the circumference of a circle?

Back

The measurement around the circle.

2.

FLASHCARD QUESTION

Front

What is the diameter of a circle?

Back

The distance across the circle through its center.

3.

FLASHCARD QUESTION

Front

What is the radius of a circle?

Back

The distance from the center of the circle to an edge.

4.

FLASHCARD QUESTION

Front

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

Back

5 in.

5.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

A = $\pi r^2$ where A is the area and r is the radius.

6.

FLASHCARD QUESTION

Front

If the radius of a circle is 5 cm, what is the area?

Back

A = $\pi (5)^2 = 25\pi \approx 78.5 cm^2$ .

7.

FLASHCARD QUESTION

Front

If the diameter of a circle is 19 inches, what is the radius?

Back

9.5 inches.

9.

FLASHCARD QUESTION

Front

How do you calculate the circumference of a circle?

Back

C = $\pi d$ where C is the circumference and d is the diameter.

10.

FLASHCARD QUESTION

Front

What is the circumference if the radius is 3 cm?

Back

C = $2\pi(3) = 6\pi \approx 18.85 cm$ .

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