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.

Front

How is the diameter related to the radius?

Back

The diameter is twice the length of the radius (Diameter = 2 x Radius).

Front

If the radius of a circle is 8, what is the diameter?

Back

The diameter is 16 (Diameter = 2 x 8).

Front

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

Back

The radius is 10 (Radius = Diameter / 2).

Front

What is the formula for calculating the circumference of a circle using the diameter?

Back

Circumference = π x Diameter.

Front

What is the formula for calculating the circumference of a circle using the radius?

Back

Circumference = 2 x π x Radius.

Front

What is the area of a circle in terms of the radius?

Back

Area = π x (Radius)^2.

Front

What is the area of a circle in terms of the diameter?

Back

Area = (π/4) x (Diameter)^2.

Front

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2.