π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

How do you find the circumference if you know the radius?

Use the formula $$C = 2 \times \text{π} \times r$$ .

How do you find the area if you know the diameter?

First, find the radius by dividing the diameter by 2, then use the formula $$A = \text{π} \times r^2$$ .

What is the circumference of a circle with a diameter of 18 inches?

Using the formula $$C = \text{π} \times d$$ , the circumference is approximately 56.5 inches.

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

Using the formula $$A = \text{π} \times r^2$$ , the area is approximately 113.1 cm².

What is the circumference of a circle with a radius of 8 mm?

Using the formula $$C = 2 \times \text{π} \times r$$ , the circumference is approximately 50.3 mm.

What is the diameter of a circle with a circumference of 31.4 cm?

Using the formula $$d = \frac{C}{\text{π}}$$ , the diameter is approximately 10 cm.

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

First, find the radius (8 cm), then use the formula $$A = \text{π} \times r^2$$ , the area is approximately 201.1 cm².

Circles: Circumference and Area Flashcards

Student preview

15 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the diameter of a circle?

Back

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

2.

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.

3.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

4.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

5.

FLASHCARD QUESTION

Front

If the radius of a circle is 5 cm, what is the circumference?

Back

6.

FLASHCARD QUESTION

Front

If the diameter of a circle is 10 inches, what is the area?

Back

7.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Continue with Google

Continue with Email

Continue with Classlink

Continue with Clever

or continue with

Microsoft

Apple

Others

Already have an account?

Similar Resources on Wayground

15 questions

Yr7-02-Networks-Flashcards

Flashcard

•

6th Grade

10 questions

Avaliação 8º ANO

Flashcard

•

8th Grade

10 questions

Spanish American War

Flashcard

•

5th Grade

10 questions

Appositives!!

Flashcard

•

5th Grade

10 questions

Mathematics: Real and Rational Numbers

Flashcard

•

7th Grade

8 questions

Graphic Novels Vocabulary

Flashcard

•

7th Grade

10 questions

Basic Concepts of Probability

Flashcard

•

8th Grade

15 questions

Full Blast 3 1b

Flashcard

•

6th - 8th Grade

Popular Resources on Wayground

15 questions

Fractions on a Number Line

Quiz

•

3rd Grade

10 questions

Probability Practice

Quiz

•

4th Grade

15 questions

Probability on Number LIne

Quiz

•

4th Grade

20 questions

Equivalent Fractions

Quiz

•

3rd Grade

25 questions

Multiplication Facts

Quiz

•

5th Grade

$fractions$

22 questions

fractions

Quiz

•

3rd Grade

6 questions

Appropriate Chromebook Usage

Lesson

•

7th Grade

10 questions

Greek Bases tele and phon

Quiz

•

6th - 8th Grade

Discover more resources for Mathematics

20 questions

Writing Algebraic Expressions

Quiz

•

6th Grade

20 questions

Ratios/Rates and Unit Rates

Quiz

•

6th Grade

14 questions

Volume of rectangular prisms

Quiz

•

7th Grade

15 questions

Graphing Inequalities

Quiz

•

7th - 9th Grade

20 questions

Graphing Inequalities on a Number Line

Quiz

•

6th - 9th Grade

20 questions

One Step Equations

Quiz

•

6th Grade

12 questions

One-Step Equations

Quiz

•

6th Grade

6 questions

Equations from models

Quiz

•

6th Grade