Radius and Diameter

Front

What is the definition of Radius?

Back

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

Front

What is the definition of Diameter?

Back

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

Tags

CCSS.HSG.C.A.2

Front

If the radius of a circle is 4 mm, what is the diameter?

Back

The diameter is 8 mm (2 times the radius).

Tags

CCSS.7.G.B.4

Front

If the diameter of a circle is 10 in, what is the radius?

Back

The radius is 5 in (half of the diameter).

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 line segment connecting two points on the circumference of a circle a radius or diameter?

Back

It can be either, depending on whether it passes through the center (diameter) or not (radius).

Front

What is the radius of a circle with a diameter of 70 m?

Back

The radius is 35 m.

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 8 mm, what is its diameter?

Back

The diameter is 16 mm.

Tags

CCSS.7.G.B.4

Front

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

Back

Circumference = π × Diameter.

Tags

CCSS.7.G.B.4

Front

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

Back

Circumference = 2 × π × Radius.

Tags

CCSS.7.G.B.4