1 / 22

Warm-up

Warm-up . Find the measure of each arc. Homework Review . A gazebo is to be constructed between three houses so that it will approximately be the same distance from each house.  Which would be helpful in deciding where to locate the gazebo?. EOCT Review. a) Centroid b) Circumenter

dexter-bennett
Download Presentation

Warm-up

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Warm-up Find the measure of each arc.

  2. Homework Review

  3. A gazebo is to be constructed between three houses so that it will approximately be the same distance from each house.  Which would be helpful in deciding where to locate the gazebo? EOCT Review a) Centroid b) Circumenter c) Incenter d) Orthocenter b

  4. CCGPS GeometryDay 21 (9-5-13) 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. Inscribed Angle: An angle whose vertex is on the circle and whose sides are chords of the circle INTERCEPTEDARC INSCRIBEDANGLE

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

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

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

  10. 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

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

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

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

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

  15. 2 Column Proof

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

  17. Example 8 Find y and z. z 110 110 + y =180 y y = 70 85 z + 85 = 180 z = 95

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

  19. Example 6 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

  20. Example 7 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

  21. Practice Worksheet

  22. Homework: • Worksheet

More Related