Curriculum · Geometry · Circles
Power of a Point
Chord-chord, secant-secant, tangent-secant — one theorem, three costumes.
Objectives
- State power of a point in all forms
- Choose the right configuration
- Combine with similarity
The full interactive edition of this lesson ships in v1.5. The topic is live everywhere else — the problems below feed your Circles mastery now.
Train the topic
●●●○○A central angle of a circle measures . What is the inscribed angle subtending the same arc, in degrees?AMC 10 style●●●○○A chord of a circle of radius is at distance from the center. How long is the chord?AMC 10 style●●●○○Chords and of a circle meet at inside the circle. If , , and , what is ?AMC 10 style