2. Are you ready? We heard you were going to make a few note cards - and then there might be a short quiz. Have fun!!

3. White note card circle The set of all points in a plane that are equidistant from a given point center radius diameterchords Named by its center: ОD D

4. Colored Note card Circle formulas Circumference: 2  r Area:  r² Arc - part of a circle Arc measure: a) degrees: equal to the measure of the central angle b) length: central anglearc length 360° circumference = Central angle Major arc Minor arc

5. This circle stuff is AWESOME!!

6. Hey, how about a quiz? That would be fun! You’re right! Everyone take out a piece of paper!

7. QUIZ 1.Draw circle E. Draw and label a radius, diameter, and a chord that is not a diameter. 2.Find the exact circumference and area of circle Q. 3.Name a minor arc in the circle. 4.Name a major arc in the circle. 5.Find the arc length of BC. A B C Q 95° 14 cm

8. Guess what!?! There is even more stuff to learn about circles!

9. Colored note card Angles in circles Central angle vertex is center of circle sides are radii measure is equal to arc 85° Inscribed angle vertex is on circle sides are chords measure is half the arc 43° 86°

10. Try these! Find x. x°x° 110° 56° x°x° 36° x° x°x° 160°

11. Colored note card Diameters and chords congruent chords are equidistant from center congruent chords = congruent arcs diameter  to chord – diameter bisects chord and arc

12. How about these? Math is good stuff! 8 6 Find the radius. 3 x 12 y Find x and y.

13. One more problem! Find the arc length of the minor arc. 43° 4 cm central anglearc length 360° circumference = 86 360 X 2  4 = Think about the measure of the arc. It’s not 43°! 86° Circumference: 2  r  or 3.14? Nice job! X  1.91   6

14. More problems to do, there are, young Padawan. Some with factoring? Factoring in two. Fun in all of them.

15. More to learn, there is, young Padawan. Tangents and secants to study, you must. Secants and tangents? Secants and tangents.