If a circle has a radius of 5 meters, what is its area?

The area is 78.5 square meters, calculated as A = $$\text{π}$$ x $$5^2$$ .

What is the circumference of a circle with a diameter of 10 meters?

The circumference is approximately 31.4 meters, calculated as c = $$\text{π}$$ x 10.

What does the term 'circumference' refer to?

Circumference refers to the distance around the edge of a circle.

How do you convert diameter to radius?

To convert diameter to radius, divide the diameter by 2: r = $$\frac{{d}}{2}$$ .

What is the formula for the area of a circle in terms of diameter?

The area can also be expressed as A = $$\frac{{\text{π} \times d^2}}{4}$$ .

If the radius of a circle is doubled, how does the area change?

If the radius is doubled, the area increases by a factor of four.

What is the circumference of a circle with a radius of 4 meters?

The circumference is approximately 25.12 meters, calculated as c = $$\text{π}$$ x 8.

What is the formula to find the radius if you know the circumference?

The radius can be found using the formula r = $$\frac{{c}}{2\text{π}}$$ .

Measuring Circles Flashcards

Student preview

15 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the formula to calculate the circumference of a circle?

Back

2.

FLASHCARD QUESTION

Front

What is the diameter of a circle?

Back

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

3.

FLASHCARD QUESTION

Front

What is the radius of a circle?

Back

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

4.

FLASHCARD QUESTION

Front

How do you find the area of a circle?

Back

5.

FLASHCARD QUESTION

Front

If the diameter of a circle is 6 meters, what is the radius?

Back

6.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius: d = 2r.

7.

FLASHCARD QUESTION

Front

What is the approximate value of π?

Back

The approximate value of π (pi) is 3.14.

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