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Warm up

Warm up. Review HW. EOCT Practice. Question of the Day. CCGPS Geometry. UNIT QUESTION: What special properties are found with the parts of a circle? Standard: MMC9-12.G.C.1-5,G.GMD.1-3 Today’s Question: How do we use angle measures to find measures of arcs? Standard: MMC9-12.G.C.2.

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Warm up

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  1. Warm up

  2. Review HW

  3. EOCT Practice Question of the Day

  4. CCGPS Geometry UNIT QUESTION: What special properties are found with the parts of a circle? Standard: MMC9-12.G.C.1-5,G.GMD.1-3 Today’s Question: How do we use angle measures to find measures of arcs? Standard: MMC9-12.G.C.2

  5. Inscribed Angles

  6. Case I:Central Angle: Vertex is ATthe center A  P B

  7. Case II:Inscribed Angle: Vertex is ON circle  ANGLE ARC ARC  ANGLE

  8. Inscribed Angle: An angle whose vertex is on the circle and whose sides are chords of the circle INTERCEPTEDARC INSCRIBEDANGLE

  9. YES; CL C T O L Determine whether each angle is an inscribed angle. Name the intercepted arc for the angle. 1.

  10. NO; QVR Determine whether each angle is an inscribed angle. Name the intercepted arc for the angle. 2. Q V K R S

  11. To find the measure of an inscribed angle… 160 80

  12. What do we call this type of angle? What is the value of x? What do we call this type of angle? How do we solve for y? The measure of the inscribed angle is HALF the measure of the inscribed arc!! 120 x y

  13. J K Q S M Examples 3. If m JK = 80, find m∠JMK. 40  4. If m∠MKS = 56, find m MS. 112 

  14. If two inscribed angles intercept the same arc, then they are congruent. 72

  15. Q D 3 J T 4 U Example 5 In J, m3 = 5x and m∠4 = 2x + 9. Find the value of x. x = 3

  16. If all the vertices of a polygon touch the edge of the circle, the polygon is INSCRIBED and the circle is CIRCUMSCRIBED.

  17. A circle can be circumscribed around a quadrilateral if and only if its opposite angles are supplementary. B A D C

  18. 2 Column Proof

  19. Example 6 Find y and z. z 110 110 + y =180 y y = 70 85 z + 85 = 180 z = 95

  20. If a right triangle is inscribed in a circle then the hypotenuse is the diameter of the circle. 180 diameter

  21. Example 7 In K, GH is a diameter and m∠GNH= 4x – 14. Find the value of x. 4x – 14 = 90 H K x = 26 N G

  22. Example 8 In K, m∠1 = 6x – 5 and m∠2 = 3x – 4. Find the value of x. 6x – 5 + 3x – 4 = 90 H 2 K x = 11 N 1 G

  23. Practice Worksheet

  24. Homework: • Worksheet

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