| A | B |
|---|
| major arc | greater than 180 |
| minor arc | less than 180 |
| Circumference formula | 2πr or πd |
| central angle measure | = arc measure |
| inscribed angle measure | 1/2 arc measure |
| interior angle measure | 1/2 SUM of intercepted arcs |
| exterior angle measure | 1/2 DIFFERENCE of intercepted arcs |
| length of radius | 1/2 diameter |
| triangle inscribed in a semicircle | a right triangle |
| 2 chords intersect in a circle | product of parts of chords are equal |
| secant-secant or secant-tangent relationship | outer length x whole length = outer length of other side x whole length |
| Tangent lines from the same exterior point | congruent |
| arc length formula | (central angle/360) x circumference |
| opposite angles of inscribed quadrilateral | supplementary |
| arc length | part of the circumference |
| equation of a circle | (x – h)^2 + (y – k)^2 = r^2 |
