Circumference, Radius, and Diameter

Front

What does 'circumference' mean?

Back

Distance around a circle.

Front

What is the diameter of a circle?

Back

The line segment that passes through the center of the circle and touches two points on its boundary.

Front

What is the radius of a circle?

Back

The line segment from the center of the circle to any point on its boundary.

Front

What does 'C' represent in the formula C = π·d?

Back

Circumference.

Front

What is the value of π (pi)?

Back

Approximately 3.14.

Front

How do you calculate the circumference of a circle?

Back

C = π·d, where d is the diameter.

Front

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

Back

10 cm (Diameter = 2 × Radius).

Front

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

Back

6 cm (Radius = Diameter / 2).

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius.

Front

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

Back

A = π·r², where r is the radius.