Radius and Diameter

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.

Front

What is the diameter of 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

How do you calculate the diameter if you know the radius?

Back

Diameter = 2 x Radius.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 5.4 km, what is the diameter?

Back

Diameter = 2 x 5.4 km = 10.8 km.

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

What is the formula for the area of a circle using the radius?

Back

Area = π x (Radius)^2.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle using the diameter?

Back

Circumference = π x Diameter.

Tags

CCSS.7.G.B.4

Front

If the diameter of a circle is 16 in, what is the radius?

Back

Radius = Diameter / 2 = 16 in / 2 = 8 in.

Tags

CCSS.7.G.B.4

Front

What is the unit of measurement for radius and diameter?

Back

Common units include inches (in), centimeters (cm), meters (m), and kilometers (km).

Front

Is 5.4 km a radius or diameter?

Back

5.4 km is a radius.