| A | B |
|---|
| acute angle | an angle whose measure is between 0 degrees and 180 degrees |
| acute triangle | a triangle whose three interior angles are all acute |
| angle | a plane figure formed by two rays that share a common endpoint |
| angle bisector | a ray or line segment that separates a given angle into two congruent angles |
| area | the measurement in square units of the amount of region within an enclosed plane figure |
| base of an isosceles triangle | the side of an isosceles triangle whose length is unique |
| bases of a trapezoid | the two parallel sides of the trapezoid |
| central angle of a circle | an angle whose vertex is at the center of the circle and whose sides are radii of the circle |
| chord of a circle | a line segment that joins two points on the circle |
| conclusion | the part of a theorem indicating the claim to be proved |
| corollary | a theorem that is easily proved as the consequence of another theorem |
| diameter | a line segment that joins two points on a circle and contains the center of the circle |
| dodecagon | a polygon that has exactly twelve sides |
| exterior angle of a polygon | an angle formed by one side of a polygon and an extension of a second side having a common endpoint with the first side |
| heptagon | a polygon that has exactly seven sides |
| hypotenuse | the side of a right triangle that lies opposite the right angle |
| hypothesis | the part of a theorem providing the given information |
| inscribed angle of a circle | an angle whose vertex is on the circle and whose sides are chords of the circle |
| intercept | the point at which the graph of an equation intersects an axis |
| legs of a trapezoid | the two nonparallel sides of a trapezoid |
