Honors Geometry - Circle Basics

Front

If a line is tangent to a circle, then it is ________ to the radius drawn to the point of tangency.

Back

perpendicular

Front

The distance from the center to the edge of the circle is called the ________.

Back

Radius

Front

A tangent line intersects the circle ...

Back

in exactly one point.

Front

What is the definition of a tangent line?

Back

A line that touches a circle at exactly one point.

Front

What is the diameter of a circle?

Back

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

Front

What is the center of a circle?

Back

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

Front

How do you find the radius if you know the diameter?

Back

Radius = Diameter / 2.

Front

What is the relationship between a tangent line and a radius at the point of tangency?

Back

They are perpendicular to each other.

Front

If a circle has a radius of 5, what is its diameter?

Back

10.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.