What does the term 'radius' refer to in a circle?

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

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

Use the formula $$A = \pi r^2$$ .

If a circle has a radius of 4 cm, what is its area?

50.24 cm² (using $$A = \pi r^2$$ with r = 4 cm).

What is the circumference of a circle with a radius of 10 m?

62.83 m (using $$C = 2\pi r$$ with r = 10 m).

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

78.5 cm² (using $$A = \pi r^2$$ with r = 5 cm).

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

37.68 inches (using $$C = \pi d$$ with d = 12 inches).

Circle Measurements and Properties Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the formula for finding the area of a circle?

Back

2.

FLASHCARD QUESTION

Front

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

Back

3.

FLASHCARD QUESTION

Front

What is the circumference of a circle with a diameter of 56 m?

Back

4.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

5.

FLASHCARD QUESTION

Front

What is the circumference of a circle?

Back

6.

FLASHCARD QUESTION

Front

What is the radius of a circle with a diameter of 15 mm?

Back

7.

FLASHCARD QUESTION

Front

What does the term 'diameter' refer to in a circle?

Back

The diameter is the longest distance across the circle, passing through the center.

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