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

The circumference is 37.68 cm, calculated as $$C = \text{π} \times 12 = 37.68 \text{ cm}$$ .

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

The radius is approximately 3.99 meters, calculated using the area formula: @@A = ext{π} imes r^2 ightarrow r = rac{A}{ ext{π}} = rac{50}{3.14} ightarrow r ext{ is approximately } 3.99 m@@.

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

The area is 50.24 square inches, calculated as $$A = \text{π} \times (4)^2 = 50.24 \text{ in}^2$$ .

What is the circumference of a circle with a radius of 15 feet?

The circumference is 94.2 feet, calculated as $$C = 2 \times \text{π} \times 15 = 94.2 \text{ ft}$$ .

What is the diameter of a circle with an area of 78.5 square cm?

The diameter is approximately 10 cm, calculated using the area formula: @@A = ext{π} imes r^2 ightarrow r = rac{A}{ ext{π}} ightarrow d = 2r ext{ is approximately } 10 cm@@.

What is the radius of a circle with a circumference of 31.4 meters?

The radius is 5 meters, calculated as @@C = 2 imes ext{π} imes r ightarrow r = rac{C}{2 ext{π}} = rac{31.4}{6.28} = 5 m@@.

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

The area is 452.16 square inches, calculated as $$A = \text{π} \times (12)^2 = 452.16 \text{ in}^2$$ .

What is the circumference of a circle with a diameter of 20 feet?

The circumference is 62.8 feet, calculated as $$C = \text{π} \times 20 = 62.8 \text{ ft}$$ .

Area and Circumference 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

2.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

3.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

4.

FLASHCARD QUESTION

Front

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

Back

5.

FLASHCARD QUESTION

Front

If the diameter of a circle is 30 m, what is the radius?

Back

6.

FLASHCARD QUESTION

Front

What is the circumference of a circle with a radius of 7 inches?

Back

7.

FLASHCARD QUESTION

Front

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

Back

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