Circumference of a Circle

Front

What is the formula to calculate the circumference of a circle?

Back

C = πd or C = 2πr, where C is the circumference, d is the diameter, and r is the radius.

Tags

CCSS.7.G.B.4

Front

How do you find the radius of a circle if you know the diameter?

Back

Divide the diameter by 2.

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle?

Back

The distance across a circle through its center.

Tags

CCSS.HSG.C.A.2

Front

What is the symbol for pi?

Back

π

Tags

CCSS.HSG.GMD.A.1

Front

What is a semicircle?

Back

A semicircle is half of a circle.

Front

If the radius of a circle is 5 feet, what is the diameter?

Back

10 feet, since diameter = 2 * radius.

Tags

CCSS.7.G.B.4

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

What is the approximate value of pi?

Back

3.14 or 22/7.

Tags

CCSS.HSG.GMD.A.1

Front

How can you calculate the area of a circle?

Back

A = πr², where A is the area and r is the radius.

Tags

CCSS.7.G.B.4

Front

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

Back

C = 2π(4) = 8π inches, approximately 25.13 inches.

Tags

CCSS.7.G.B.4