How do you convert diameter to radius?

To convert diameter to radius, divide the diameter by 2.

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

The area is $$A = \text{π}(\frac{6}{2})^2 = 28.26 m^2$$ .

What is the relationship between diameter and circumference?

The circumference is directly proportional to the diameter, expressed as $$C = \text{π}d$$ .

What is the value of π (pi)?

π (pi) is approximately 3.14, but it is an irrational number with a non-repeating decimal.

If the area of a circle is 113.04 cm², what is its radius?

The radius can be found using the formula: $$r = \text{√}(\frac{A}{\text{π}}) = \text{√}(\frac{113.04}{\text{π}}) ≈ 6 cm$$ .

What is the formula for the circumference of a circle?

The circumference can be calculated using the formula: $$C = 2\text{π}r$$ .

What does it mean if a shape has a larger area?

A larger area means that the shape occupies more space compared to a shape with a smaller area.

What is the area of a circle with a radius of 4 inches?

The area is $$A = \text{π}(4^2) = 50.27 in^2$$ .

Circumference and Area of Circles Part 1 Flashcards

Student preview

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 circumference of a circle?

Back

3.

FLASHCARD QUESTION

Front

What does diameter mean?

Back

The diameter is the distance across a circle, passing through the center, and is twice the length of the radius.

4.

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. It is half of the diameter.

5.

FLASHCARD QUESTION

Front

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

Back

The radius is 5 cm, since the radius is half of the diameter.

6.

FLASHCARD QUESTION

Front

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

Back

7.

FLASHCARD QUESTION

Front

What does area mean in geometry?

Back

Area refers to the amount of space inside a shape, measured in square units.

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