Find the area of a circle with a radius of 7 inches. Leave your answer in terms of $$\text{π}$$ .

The area is $$A = \text{π}(7^2) = 49\text{π}$$ square inches.

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

The diameter is $$d = \frac{C}{\text{π}} = \frac{12\text{π}}{\text{π}} = 12$$ cm.

What part of a circle is defined as the distance from the center to any point on the circle?

This part is called the radius.

If the area of a circle is 36π square meters, what is the radius?

To find the radius, use the area formula: $$A = \text{π}r^2$$ . Thus, $$36\text{π} = \text{π}r^2$$ , leading to $$r^2 = 36$$ , so $$r = 6$$ meters.

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

The circumference is $$C = \text{π}d = \text{π}(10) = 10\text{π}$$ cm.

What is the area of a circle with a diameter of 8 inches? Leave your answer in terms of $$\text{π}$$ .

The radius is 4 inches, so the area is $$A = \text{π}(4^2) = 16\text{π}$$ square inches.

What is the term for the longest distance across a circle through its center?

This term is called the diameter.

If a circle has a radius of 2.5 feet, what is its area?

The area is $$A = \text{π}(2.5^2) = 6.25\text{π}$$ square feet.

What is the circumference of a circle with a radius of 1 meter?

The circumference is $$C = 2\text{π}(1) = 2\text{π}$$ meters.

Unit 10B Flashcard #1 Review 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 circumference of a circle?

Back

3.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

4.

FLASHCARD QUESTION

Front

If a circle has a radius of 5 cm, what is its diameter?

Back

5.

FLASHCARD QUESTION

Front

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

Back

6.

FLASHCARD QUESTION

Front

Back

7.

FLASHCARD QUESTION

Front

What is the circumference of a circle with a radius of 3 meters?

Back

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