Circles

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its edge.

Front

What is the diameter of a circle?

Back

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

Front

What is pi (π)?

Back

Pi is a mathematical constant approximately equal to 3.14, representing the ratio of a circle's circumference to its diameter.

Front

How do you calculate the circumference of a circle?

Back

Circumference = 2 × π × radius or Circumference = π × diameter.

Front

What is the area of a circle?

Back

Area = π × radius².

Front

What is the relationship between diameter and radius?

Back

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

Front

What does it mean for a line to be a radius of a circle?

Back

A radius is any line segment from the center of the circle to its edge.

Front

What does it mean for a line to be a diameter of a circle?

Back

A diameter is a line segment that passes through the center of the circle and connects two points on its edge.

Front

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

Back

Circumference = π × diameter.

Front

What is the formula for finding the area of a circle using diameter?

Back

Area = (π/4) × diameter².