Radius and Diameter

Front

What is the definition of a radius in a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the definition of a diameter in a circle?

Back

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

Tags

CCSS.HSG.C.A.2

Front

If the diameter of a circle is 40 ft, what is the radius?

Back

20 ft (Radius = Diameter / 2).

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 18, what is the diameter?

Back

36 (Diameter = Radius x 2).

Tags

CCSS.7.G.B.4

Front

How do you calculate the circumference of a circle using the radius?

Back

Circumference = 2 * π * radius.

Tags

CCSS.7.G.B.4

Front

How do you calculate the area of a circle using the radius?

Back

Area = π * radius^2.

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

Is the red line a radius or diameter if it passes through the center and touches two points on the circumference?

Back

Diameter.

Front

Is the red line a radius or diameter if it connects the center to a point on the circumference?

Back

Radius.

Front

What is the diameter of a circle if the radius is 10?

Back

20 (Diameter = Radius x 2).

Tags

CCSS.7.G.B.4