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Day 26 – Secant and Tangent Angles

Day 26 – Secant and Tangent Angles. Analytic Geometry for College Graduates. What are we learning today?. MCC9-12.G.C.2: Identify and describe relationships among inscribed angles, radii, and chords. Include the relationship between central, inscribed, and circumscribed angles.

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Day 26 – Secant and Tangent Angles

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  1. Day 26 – Secant and Tangent Angles Analytic Geometry for College Graduates

  2. What are we learning today? MCC9-12.G.C.2: Identify and describe relationships among inscribed angles, radii, and chords. Include the relationship between central, inscribed, and circumscribed angles. MCC9-12.G.C.4: Construct a tangent line from a point outside a given circle to the circle. • Objectives for today! • Construct a tangent line from the perimeter of the circle • Identify the vertex • Identify whether the angle is a central angle, an inscribed angle, an angle made by 2 chords, 2 secants, a chord and a secant, or 2 tangents • Find the measure of the angle depending on the location of the vertex

  3. Let’s Review: Make sure you are following along as we complete the table below together as a class. 360 lines circle 2

  4. Review Continued 1 circle perpendicular circle

  5. Case I:Vertex is AT the center A P C B

  6. Case II:Vertex is ON circle ANGLE ARC ARC ANGLE

  7. Case III:Vertex is INSIDE circle A ARC B ANGLE D ARC C Looks like a PLUS sign!

  8. Case IV:Vertex is OUTSIDE circle C ANGLE small ARC A D LARGE ARC B

  9. What does each case have in common? It’s all about the location of the vertex!

  10. Guided Practice: Identifying the Vertex Directions: Circle the vertex in each of the following problems Now that you have identified the vertex, let’s label the vertex as either ON the circle, INSIDE the circle, OUTSIDE the circle, or at the CENTER of the circle.

  11. vertex vertex Angle = arc Arc = angle 2

  12. Ex. 1 Find m1. 1 84° m<1 = 42

  13. 202° Ex. 2 Find m1. 1 m<1 = 79

  14. Ex. 3 Find m1. 93° A B 1 D C 113° m<1 = 103

  15. Ex. 4 Find mQT. mQT = 100 N Q 84 92 M T

  16. Ex. 5 Find x. 93 xº 45 89 x = 89

  17. Ex. 6 Find m1. 1 15° A D 65° B m<1 = 25

  18. Ex. 7 Find mAB. mAB = 16 A 27° 70° B

  19. Ex. 8 Find m1. 260° 1 m<1 = 80

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