Intro To Circles

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center.

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 circumference of a circle?

Back

The circumference is the distance all the way around the circle.

Front

What does the symbol 'π' (pi) represent?

Back

Pi is the ratio of the circumference of a circle to its diameter, approximately equal to 3.14.

Front

How do you calculate the circumference of a circle?

Back

Circumference = π × diameter.

Front

If the diameter of a circle is 10 inches, what is the radius?

Back

Radius = diameter / 2 = 10 in / 2 = 5 in.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

If the radius of a circle is 3 inches, what is the area?

Back

Area = π × (3 in)² = 9π in², approximately 28.27 in².

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.