Radius and Diameter

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius. To go from radius to diameter, multiply by 2.

Tags

CCSS.7.G.B.4

Front

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

Back

Circumference = π × diameter (or C = 3.14 × diameter).

Tags

CCSS.7.G.B.4

Front

If the diameter of a circle is 20, what is the radius?

Back

The radius is 10 (radius = diameter ÷ 2).

Tags

CCSS.7.G.B.4

Front

What is the definition of radius?

Back

A radius is a straight line from the center of a circle to any point on its circumference.

Front

What is the definition of diameter?

Back

The diameter is a straight line that passes through the center of a circle and touches two points on its circumference.

Front

If the radius of a circle is 5, what is the diameter?

Back

The diameter is 10 (diameter = radius × 2).

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 8?

Back

The circumference is 25.12 (C = 3.14 × 8).

Tags

CCSS.7.G.B.4

Front

What is the radius if the diameter is 16?

Back

The radius is 8 (radius = diameter ÷ 2).

Tags

CCSS.7.G.B.4

Front

What do you multiply the radius by to find the diameter?

Back

Multiply the radius by 2.

Tags

CCSS.7.G.B.4

Front

What do you multiply the diameter by to find the circumference?

Back

Multiply the diameter by 3.14.

Tags

CCSS.7.G.B.4