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Brain Buster

Brain Buster. 1. Draw 4 concentric circles. 2. Draw a circle with r = 4 and center A. 3. What is the difference between a chord and a diameter of a circle?. 4. Explain the difference between a secant & a chord.

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Brain Buster

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  1. Brain Buster 1. Draw 4 concentric circles 2. Draw a circle with r = 4 and center A. 3. What is the difference between a chord and a diameter of a circle? 4. Explain the difference between a secant & a chord 5. What do you know about a tangent line and the radius drawn to the point of tangency?

  2. Math II UNIT QUESTION: What special properties are found with the parts of a circle? Standard: MM2G1, MM2G2 Today’s Question: How do we use angle measures to find measures of arcs? Standard: MM2G3.a,d

  3. Central Angle : An Angle whose vertex is at the center of the circle ACB AB A Major Arc Minor Arc More than 180° Less than 180° P To name: use 3 letters C To name: use 2 letters B APB is a Central Angle

  4. EDF Semicircle: An Arc that equals 180° To name: use 3 letters E D P F

  5. THINGS TO KNOW AND REMEMBER ALWAYS A circle has 360 degrees A semicircle has 180 degrees Vertical Angles are Equal

  6. measure of an arc = measure of central angle m AB m ACB m AE A E 96 Q = 96° B C = 264° = 84°

  7. Arc Addition Postulate m ABC = m AB + m BC A C B

  8. m DAB = Tell me the measure of the following arcs. 240 D A 140 260 m BCA = R 40 100 80 C B

  9. CONGRUENT ARCS Congruent Arcs have the same measure and MUST come from the same circle or of congruent circles. C B D 45 45 110 A

  10. Classwork • Workbook Page 204 #12-24

  11. Homework: • Page 193 #9-23

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