Circle Terminology

Front

What is a central angle in a circle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides are radii that extend to the circumference.

Tags

CCSS.HSG.C.A.2

Front

What is a tangent line in relation to a circle?

Back

A tangent line is a straight line that touches the circle at exactly one point and does not cross into the circle.

Front

What is a chord in a circle?

Back

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

Front

What is the definition of a circle?

Back

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

Front

What is a major arc in a circle?

Back

A major arc is an arc that is larger than a semicircle, spanning more than 180 degrees.

Front

What is a minor arc in a circle?

Back

A minor arc is an arc that is smaller than a semicircle, spanning less than 180 degrees.

Tags

CCSS.HSG.C.B.5

Front

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

Back

The diameter of a circle is twice the length of the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

The circumference of a circle is given by the formula C = 2πr, where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

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

Tags

CCSS.7.G.B.4

Front

What is a semicircle?

Back

A semicircle is half of a circle, formed by a diameter and the arc connecting its endpoints.