>>Today we started class reviewing some concepts we learned yesterday:

Chord - segment whose endpoints are on the circle. The greatest chord is the diameter.

Central Angle - angle whose vertex is circle's center, and forms major and minor arcs.

Measure of arc - measure of central angle (degrees)

Length of arc - central angle divided by 360 times circumference

Miss Saatkamp also taught us the difference between a point on the circle, a point in the circle and a point outside the circle.

A is center
B is ON the circle

C is IN the circle

D is OUTSIDE the circle

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After that, we corrected homework.

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Today we also learned new theorems and a new concept.

-Theorem 9-1:

if: chord BC is congruent to chord DE (green lines)

then: Arc BC is congruent to DE (pink lines)

*Inscribed Polygons - Polygons whose vertices are ON the circle (ex: Polygon BCDE)

-Theorem 9-2:


if: BC is a diameter; DE is a chord; BC is perpendicular to DE

then: Chord DE and arc DE are bisected

*Extention: With radii the theorem works the same way.

-Theorem 9-3:

if: BC and DE are chords; BC and DE are equidistant from the center (meaning AG is congruent to AF)

then: BC is congruent to DE

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At the end we got our homework, which is only due MONDAY - Page 462 #13-27 all + 32-34

DON'T FORGET!! Projects are due NEXT WEEK!!!