π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

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

Use the formula $$C = 2 \times \text{π} \times r$$ .

How do you find the area if you know the diameter?

First, find the radius by dividing the diameter by 2, then use the formula $$A = \text{π} \times r^2$$ .

What is the circumference of a circle with a diameter of 18 inches?

Using the formula $$C = \text{π} \times d$$ , the circumference is approximately 56.5 inches.

What is the area of a circle with a radius of 6 cm?

Using the formula $$A = \text{π} \times r^2$$ , the area is approximately 113.1 cm².

What is the circumference of a circle with a radius of 8 mm?

Using the formula $$C = 2 \times \text{π} \times r$$ , the circumference is approximately 50.3 mm.

What is the diameter of a circle with a circumference of 31.4 cm?

Using the formula $$d = \frac{C}{\text{π}}$$ , the diameter is approximately 10 cm.

What is the area of a circle with a diameter of 16 cm?

First, find the radius (8 cm), then use the formula $$A = \text{π} \times r^2$$ , the area is approximately 201.1 cm².

Circles: Circumference and Area Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the diameter of a circle?

Back

The diameter is the distance across a circle through its center, equal to twice the radius.

2.

FLASHCARD QUESTION

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

3.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

4.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

5.

FLASHCARD QUESTION

Front

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

Back

6.

FLASHCARD QUESTION

Front

If the diameter of a circle is 10 inches, what is the area?

Back

7.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

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