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

The area is A = $$\text{π}(5)^2$$ = 78.54 in².

What is the circumference of a circle with a radius of 3 feet?

The circumference is C = $$2\text{π}(3)$$ = 18.85 ft.

If a circle has an area of 50 cm², what is the radius?

To find the radius, use the formula: r = $$\text{√}\frac{A}{\text{π}}$$ . For A = 50 cm², r ≈ 3.99 cm.

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

The radius is 6 m, so the area is A = $$\text{π}(6)^2$$ = 113.10 m².

What is the circumference of a circle with an area of 78.54 cm²?

First, find the radius: r = $$\text{√}\frac{78.54}{\text{π}}$$ ≈ 5 cm. Then, C = $$2\text{π}(5)$$ = 31.42 cm.

What happens to the area if the radius is doubled?

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

What is the area of a circle with a radius of 10 cm?

The area is A = $$\text{π}(10)^2$$ = 314.16 cm².

If the circumference of a circle is 62.83 cm, what is the radius?

Using C = $$2\text{π}r$$ , the radius is r = $$\frac{62.83}{2\text{π}}$$ ≈ 10 cm.

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

2.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

3.

FLASHCARD QUESTION

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately equal to 3.14.

4.

FLASHCARD QUESTION

Front

If the radius of a circle is 7 cm, what is the area?

Back

5.

FLASHCARD QUESTION

Front

If the diameter of a circle is 10 m, what is the circumference?

Back

6.

FLASHCARD QUESTION

Front

What is the relationship between radius and diameter?

Back

The diameter (d) of a circle is twice the radius (r): d = 2r.

7.

FLASHCARD QUESTION

Front

How do you convert diameter to radius?

Back

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