| Definition | PG Term |
| An angle whose measure is between 90 and 180 degrees. | |
| A line segment has two... | |
| The side of a right triangle that is opposite the right angle. | |
| A triangle with three congruent angles. | |
| Two angles whose sides form two pairs of opposite rays. The angles form an 'X'. | |
| A triangle with at least 2 congruent sides and angles. | |
| a segment drawn from a vertex perpendicular to the opposite side | |
| Points that lie in the same plane. | |
| a ray that divides an angle into two angles that are congruent. | |
| SAS | |
| HL | |
| Two adjacent angles who are supplementary | |
| SSS | |
| ASA | |
| Two angles whose sum is 90 degrees. | |
| two angles that are formed by parallel lines and a transversal and occupy corresponding positions | |
| The point where three perpendicular bisectors intersect in a triangle. | |
| The point where three angle bisectors intersect in a triangle | |
| Two angles that are formed by parallel lines and a transversal and lie between the parallel lines and on opposite sides of the transversal. | |
| A line drawn perpendicular to a side through its midpoint. | |
| A point that divides, or bisects, a segment into two congruent segments. | |
| Points that line in the same plane | |
| The point where three altitudes intersect in a triangle | |
| An angle that measures 180 degrees. | |
| An angle whose measure is equal to 90 degrees | |
| A triangle with no congruent sides. | |
| Two angles that share a common vertex and side. | |