Circumference and Area of Circles

Front

What is circumference?

Back

The distance around a circle.

Front

The distance halfway across the circle is called the...

Back

radius.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

A = πr², where r is the radius.

Tags

CCSS.7.G.B.4

Front

If the radius is 5 inches, what is the circumference?

Back

31.4 inches.

Tags

CCSS.7.G.B.4

Front

If the radius is 10 inches, what is the area?

Back

314.16 square inches.

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle?

Back

A line from one side of the circle to the other, passing through the center.

Front

If the diameter is 12 inches, what is the radius?

Back

6 inches.

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

Diameter = 2 × Radius.

Tags

CCSS.7.G.B.4

Front

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

Back

50.24 inches.

Tags

CCSS.7.G.B.4