| A | B |
|---|
| acute angle | a angle less than 90 degrees |
| central angle | an angle whose vertex in in the center of the circle |
| Chord | a segment whose end points lie on a circle |
| compass | a tool used to draw circles |
| complementary angles | two angles that measure 90 degrees |
| circumference | the distance around the circle |
| diameter | the distance across the cirlce |
| polygon | a closed sided figure |
| obtuse angle | angles that measure more that 90 degress, but less than 180. |
| radius | the distance from the center of the circle |
| minor arc | less than a semi circle |
| major arc | more than a semi circle |
| central angle | vertex in the center of the circle. |
| 360 degrees | measures the distance around the circle. |
| perpendicular | lines that intersect at 90 angles |
| A = 1/2(b1 + b2) x height | Area of a Trapeziod |
| pi | 22/7 or 3.14 |
| concentric circle | a circle within another circle |
| similar | same shape, differnent size. |
| congruent | same size ,same shape |
