If a circle's circumference is 19 in, how do you find the radius?

Use the formula: $$C = 2 \\pi \\times r$$ , so $$r = \frac{C}{2\\pi}$$ .

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

Use the formula: $$A = \\pi \\times r^2$$ , so $$A = 16\\pi$$ or approximately 50.24 in².

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

$$A = \\frac{\\pi}{4} \\times d^2$$ .

How do you convert diameter to radius?

Divide the diameter by 2: $$r = \frac{d}{2}$$ .

What is the circumference of a circle with a radius of 5 in?

Use the formula: $$C = 2 \\pi \\times r$$ , so $$C = 10\\pi$$ or approximately 31.42 in.

If the area of a circle is 28.26 in², what is the radius?

Use the formula: $$A = \\pi \\times r^2$$ , so $$r = \sqrt{\frac{A}{\\pi}}$$ .

What is the relationship between area and circumference in circles?

Both depend on the radius, but area increases with the square of the radius while circumference increases linearly.

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

If you know the circumference $$C$$ , use $$A = \frac{C^2}{4\\pi}$$ .

IM 7th Unit 3 Review B Flashcards

Student preview

15 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

2.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

3.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

4.

FLASHCARD QUESTION

Front

How do you calculate the circumference of a circle with a diameter of 15 mm?

Back

5.

FLASHCARD QUESTION

Front

What does it mean for a relationship to be proportional?

Back

A proportional relationship means that two quantities maintain a constant ratio.

6.

FLASHCARD QUESTION

Front

How can you determine if a table shows a proportional relationship?

Back

Check if the ratios of corresponding values are constant.

7.

FLASHCARD QUESTION

Front

Back

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