How many square feet are in the area of a circle with a radius of 4 feet?

Using the area formula: $$A = \\pi r^2$$ , we find: $$A = \\pi (4)^2 = 16\\pi \\approx 50.27 \\text{ ft}^2$$ .

What is the circumference of a circle with a radius of 2 cm?

Using the circumference formula: $$C = 2\\pi r$$ , we find: $$C = 2\\pi (2) = 4\\pi \\approx 12.57 \\text{ cm}$$ .

If the area of a circle is 50 square units, how do you find the radius?

To find the radius from the area, use: $$r = \\sqrt{\\frac{A}{\\pi}}$$ .

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

Using the circumference formula: $$C = \\pi d$$ , we find: $$C = \\pi (12) = 12\\pi \\approx 37.70 \\text{ inches}$$ .

If a circular park has a radius of 10 meters, what is the distance around it?

The distance around the park (circumference) is: $$C = 2\\pi (10) = 20\\pi \\approx 62.83 \\text{ meters}$$ .

What is the area of a circle with a diameter of 8 feet?

Using the area formula: $$A = \\pi r^2$$ , first find the radius: $$r = 4$$ . Then, $$A = \\pi (4)^2 = 16\\pi \\approx 50.27 \\text{ ft}^2$$ .

How do you calculate the area of a circle if you only know the circumference?

Use the formula: $$A = \\frac{C^2}{4\\pi}$$ .

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

Using the area formula: $$A = \\pi r^2$$ , we find: $$A = \\pi (5)^2 = 25\\pi \\approx 78.54 \\text{ in}^2$$ .

Circumference or Area Flashcards

Student preview

15 questions

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1.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

2.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

3.

FLASHCARD QUESTION

Front

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

Back

4.

FLASHCARD QUESTION

Front

How do you find the radius if you know the circumference?

Back

5.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

6.

FLASHCARD QUESTION

Front

If a circle has a diameter of 10 inches, what is its circumference?

Back

7.

FLASHCARD QUESTION

Front

What is the area of a circle with a radius of 3 meters?

Back

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