Radius or Diameter

Front

What is the definition of a 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 a diameter?

Back

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

Front

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

Back

10 cm (Diameter = 2 x Radius).

Front

If the diameter of a circle is 12 m, what is the radius?

Back

6 m (Radius = Diameter / 2).

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

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

Back

Circumference = 2 x π x Radius.

Front

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

Back

Area = π x (Radius)^2.

Front

What is the formula for the diameter if you know the circumference?

Back

Diameter = Circumference / π.

Front

What is the formula for the radius if you know the area?

Back

Radius = √(Area / π).

Front

If a circle has a radius of 10 units, what is its circumference?

Back

62.83 units (Circumference = 2 x π x 10).