Coplanar Circles and Common Tangents

It is the point of intersection of the tangent line and the circle.

• Point of Tangency

• Radius

• Circle

• Tangent

A line that intersects a circle in exactly 1 point

• chord

• tangent

• secant

• diameter

If a tangent and a chord intersect, then each angle formed is 1/2 of its intercepted arc

• True

• False

If a line is tangent to a circle, how many points does the line touch on the circle?

• All of them

• None of them

• All except one

• One and only one.

How many degrees in the angle at C?

The tangent to a circle meets the end of a radius of the circle. What type of angle is formed?

• Scalene

• Right angle

• Obtuse angle

• Perfect angle

How do you KNOW the line is a tangent to this circle?

• My friend said so.

• The drawing looks right.

• The line AB makes 180 degrees.

Find x. Assume that segments that appear to be tangent are tangent. Round to the nearest whole number.

What can you conclude?

• AB and AC are not congruent.

• AB= half of AC

• AC = half of AB

• AB=AC

Find the radius r