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4 cards from this section. Quick, good the night before a test.
What is a tangent?
Think about how a line interacts with a circle.
How many points can a tangent touch a circle?
Consider the definition of a tangent.
A tangent intersects a circle at how many points?
Recall the definition of a tangent.
True or False: A tangent can intersect the circle in two points.
Think about what a tangent does to a circle.
Prove that at any point on a circle, there can only be one tangent line.
Use the perpendicular theorem.
A circle has a radius of 4 cm. What is the length of the tangent from a point 5 cm away from the center to the point of contact?
Tangent length = √(distance² - radius²).
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