Parts of a circle

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 circumference.

Front

What is the diameter of a circle?

Back

The diameter is a line segment that passes through the center of the circle and connects two points on the circumference. It is twice the length of the radius.

Front

What is a chord in a circle?

Back

A chord is a line segment that joins two points on the circumference of the circle.

Front

Is a diameter also a chord?

Back

Yes, a diameter is a special type of chord that passes through the center of the circle.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle, calculated as C = πd, where d is the diameter.

Front

What is an arc in a circle?

Back

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

Front

What is a sector in a circle?

Back

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

Front

How do you calculate the radius if the diameter is known?

Back

The radius is half of the diameter. Formula: r = d/2.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

Front

What is the formula for the area of a circle?

Back

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