Circles Review

Front

What is the definition of a circle?

Back

A circle is a set of points in a plane that are equidistant from a fixed point called the center.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is given by 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 given by the formula A = πr², where r is the radius.

Front

What is an arc in a circle?

Back

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

Front

How do you find the measure of a minor arc?

Back

The measure of a minor arc is equal to the measure of the central angle that subtends it.

Front

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

Back

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

Front

What is a chord in a circle?

Back

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

Front

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

Back

The circumference of a circle is directly proportional to its radius.

Front

What is the formula for the perimeter of a semicircle?

Back

The perimeter (P) of a semicircle is given by P = πr + 2r, where r is the radius.

Front

How do you calculate the length of an arc?

Back

The length of an arc can be calculated using the formula: Length = (θ/360) × 2πr, where θ is the central angle in degrees.