1. 9-5 Inscribed Angles

2. Inscribed angles --
An angle whose vertex is on a circle and whose sides contain chords of the circle.

4. Measures of inscribed angles
Theorem:
The measure of an inscribed angle is equal to half the measure of its intercepted arc.

5. Examples

7. Corollary
If 2 inscribed angles intercept the same arc, then the angles are congruent.

9. Corollary
An angle inscribed in a semicircle is a right angle.

10. Corollary
If a quadrilateral is inscribed in a circle, then its opposite angles are supplementary.

12. How do you find the measure of angle 1
How do you find the measure of angle 1? Is that true for wherever B goes?

13. Theorem
The measure of an angle formed by a chord and a tangent is equal to half the measure of the intercepted arc.