Warm up You have 10 minutes 1. 15° 3. 45 ° 5.180 ° 7. 45 ° 9. 90 ° 11. 90 ° 13. 150 ° 2. 90° 4. 150° 6. 90° 8. 30° 10. 15° 12. 45° 14. 45° This will be.

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Presentation transcript:

Warm up You have 10 minutes 1. 15° ° ° ° ° ° ° 2. 90° ° 6. 90° 8. 30° ° ° ° This will be taken for a grade today. (really.)

9.4 Angles formed by Secants & Tangents When dealing with angles and circles, the vertex can be: ON the circle IN the circle or OUTSIDE the circle

Case 1 – Vertex in ON the circle Secant & Tangent2 Secants M angle = ½ of the intercepted arc 200° 100° 50°

Case 2 – Vertex is INSIDE the circle m angle = ½ the SUM of the intercepted arcs 40° 80° 60° Two Secants 100° 50° 75°

Case 3 – Vertex is OUTSIDE the circle m angle = ½ the DIFFERENCE of the intercepted arcs Two Secants One Tangent One Secant Two Tangents 220° 180° 30° 40° 100° 70° 80° 50° 80°

Whiteboards please

Your assignment Biggest Circle Puzzle