Parts of a Circle

Front

What is the definition of a radius in a circle?

Back

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

Front

What is the diameter of a circle?

Back

The diameter is a line segment that passes through the center of the circle and has its endpoints on the circle, and it is twice the length of the radius.

Front

How do you calculate the circumference of a circle?

Back

The circumference of a circle can be calculated using the formula C = 2πr, where r is the radius.

Front

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

Back

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

Front

What is the formula for the area of a circle?

Back

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

Front

What is the term for the distance around a circle?

Back

The distance around a circle is called the circumference.

Front

If the radius of a circle is 2 cm, what is the diameter?

Back

If the radius is 2 cm, the diameter is 4 cm (d = 2r).

Front

What is the value of π (pi) approximately?

Back

The value of π (pi) is approximately 3.14.

Front

What is a chord in a circle?

Back

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

Front

What is a sector of a circle?

Back

A sector is a region of a circle bounded by two radii and the arc between them.