Parts of A Circle, Part B

Front

What is the radius of a circle?

Back

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

Front

What does the diameter of a circle represent?

Back

The diameter is the longest chord of the circle, passing through the center and connecting two points on the circumference.

Front

Define the circumference of a circle.

Back

The circumference is the distance around the circle, calculated as C = 2πr, where r is the radius.

Front

What is a chord in a circle?

Back

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

Front

What is an arc in a circle?

Back

An arc is a portion of the circumference of a circle.

Front

What is a sector of a circle?

Back

A sector is a region enclosed by two radii and the arc between them.

Front

How do you calculate the area of a circle?

Back

The area A of a circle is calculated using the formula A = πr², where r is the radius.

Front

What is the relationship between the radius and diameter?

Back

The diameter is twice the length of the radius (d = 2r).

Front

What is the formula for the circumference of a circle?

Back

The formula for the circumference is C = 2πr or C = πd, where d is the diameter.

Front

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

Back

The diameter is 10 cm (d = 2r).