Circles Review

Front

What are concentric circles?

Back

Concentric circles are circles that share the same center but have different radii.

Front

What is the definition of an arc in a circle?

Back

An arc is a part of the circumference of a circle, defined by two endpoints on the circle.

Front

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

Back

The radius is half of the diameter. If the diameter is 6 ft, the radius is 3 ft.

Front

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

Back

The radius is half the length of the diameter.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is calculated using the formula C = 2πr, where r is 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.

Front

What is the distance across a circle through the center called?

Back

The distance across a circle through the center is called the diameter.

Front

If a circle has a radius of 4 cm, what is its diameter?

Back

The diameter would be 8 cm, as it is twice the radius.

Front

What is the term for the distance from the center of a circle to any point on its circumference?

Back

This distance is called the radius.

Front

What do you call the longest chord in a circle?

Back

The longest chord in a circle is the diameter.