Radius and Diameter

Front

What is the definition of a radius in a circle?

Back

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

Front

What is the definition of a diameter in a circle?

Back

A diameter is a straight line segment that passes through the center of the circle and whose endpoints lie on the circumference.

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 10 mm, what is the diameter?

Back

The diameter would be 20 mm.

Front

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

Back

Circumference = π x Diameter.

Front

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

Back

Area = π x (Radius)^2.

Front

If the diameter of a circle is 30 cm, what is the radius?

Back

The radius would be 15 cm.

Front

What is the relationship between the radius and the circumference of a circle?

Back

Circumference = 2 x π x Radius.

Front

What is the significance of the center of a circle in relation to the radius and diameter?

Back

The center is the point from which all radii are measured and is also the midpoint of the diameter.

Front

Can a radius be longer than a diameter? Why or why not?

Back

No, a radius cannot be longer than a diameter because the diameter is defined as twice the length of the radius.