Circumference

Front

What is the circumference of a circle?

Back

The distance around the circle.

Tags

CCSS.7.G.B.4

Front

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

Back

C = π·d, where C is the circumference and d is the diameter.

Tags

CCSS.7.G.B.4

Front

What does the symbol π (pi) represent?

Back

Approximately 3.14, it is the ratio of the circumference of a circle to its diameter.

Tags

CCSS.HSG.GMD.A.1

Front

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

Back

C = π·d = 3.14 × 5 = 15.7 cm.

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle?

Back

A line segment that passes through the center of the circle and has its endpoints on the circle.

Front

How do you find the radius of a circle?

Back

The radius is half of the diameter.

Tags

CCSS.7.G.B.4

Front

If the circumference of a circle is 31.4 cm, what is the diameter?

Back

d = C/π = 31.4/3.14 = 10 cm.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (d = 2r).

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 7 cm?

Back

C = 2πr = 2 × 3.14 × 7 = 43.96 cm.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

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

Tags

CCSS.7.G.B.4