What is the area of a circle with a diameter of 12 cm?

$$A = \\pi (6^2) = 36\pi \approx 113.1 cm^2$$ .

What is the formula for circumference of a circle?

$$C = \pi d$$ or $$C = 2\pi r$$ .

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

The area increases by a factor of 4.

What is the definition of a circle?

A circle is a set of points in a plane that are equidistant from a fixed point called the center.

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

$$10 cm$$ (Diameter = 2 \times Radius).

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

$$A = \\pi (3^2) = 9\pi \approx 28.3 cm^2$$ .

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

$$C = 2\pi(4) = 8\pi \approx 25.1 cm$$ .

Semester Exam 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 with a diameter of 10 cm?

Back

3.

FLASHCARD QUESTION

Front

How do you convert map distance to actual distance using a scale?

Back

Multiply the map distance by the scale factor.

4.

FLASHCARD QUESTION

Front

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

Back

5.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

6.

FLASHCARD QUESTION

Front

If a circle has a circumference of 62.8 cm, what is its diameter?

Back

7.

FLASHCARD QUESTION

Front

What is the scale factor if 2.5 inches on a map represents 50 miles?

Back

Scale factor = 50 miles / 2.5 inches = 20 miles per inch.

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