Geometry (Litell/McDougal) Ch 10 - 2025

Front

What is a line in geometry?

Back

A line is a straight one-dimensional figure that has no thickness and extends infinitely in both directions.

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's circumference.

Front

What does it mean for a line to be tangent to a circle?

Back

A line is tangent to a circle if it touches the circle at exactly one point.

Front

What is a diameter of a circle?

Back

A diameter is a line segment that passes through the center of the circle and has its endpoints on the circle.

Front

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

Back

The tangent line is perpendicular to the radius at the point where it touches the circle.

Front

How do you find the center of a circle given its equation?

Back

For the equation (x-h)² + (y-k)² = r², the center is (h, k).

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 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 measure of an angle formed by a tangent and a chord through the point of contact?

Back

The measure of the angle is equal to half the measure of the intercepted arc.

Front

What is the relationship between angles formed by two tangents drawn from a point outside the circle?

Back

The angles are equal to half the difference of the measures of the intercepted arcs.