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Find Arc Measures

Find Arc Measures. 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.

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Find Arc Measures

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  1. Find Arc Measures

  2. 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

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

  4. THINGS TO KNOW AND REMEMBER ALWAYS A circle has 360 degrees A semicircle has 180 degrees Vertical Angles are Equal A D B C

  5. measure of an arc = measure of central angle m AB m ACB m AE • EQA is a central angle. IfÐEQAis 80° then EA = 80° A E = 96° 96 Q B 264° = C 84° =

  6. Arc Addition Postulate m ABC = m AB + m BC A Arc Addition Postulate: The measure of an arc formed by two adjacent arcs is the sum of the measures of the two arcs. C B

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

  8. P 6 12 R P R Q Q

  9. Practice!! page 193 (2-8 evens, 9-23 all)

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