Parts of a Circle

Front

What is a circle?

Back

A circle is a round shape where all points are equidistant from a central point called the center.

Front

What is the center of a circle?

Back

The center of a circle is the point that is equidistant from all points on the 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 the circle.

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through the center, equal to twice the radius.

Tags

CCSS.HSG.C.A.2

Front

How is the diameter related to the radius?

Back

The diameter is twice the length of the radius (Diameter = 2 x Radius).

Tags

CCSS.7.G.B.4

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 secant line?

Back

A secant line is a line that intersects a circle at two points.

Front

What is a tangent line?

Back

A tangent line is a line that touches the circle at exactly one point.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle, calculated as C = π x Diameter.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

The area is the space contained within the circle, calculated as A = π x Radius².

Tags

CCSS.7.G.B.4