| A | B |
|---|
| Congruent triangles | triangles whose vertices can be matched up so that the corresponding parts of the triangles are congruent |
| Congruent polygons | polygons whose vertices can be matched up so that the corresponding parts of the polygons are congruent |
| CPCT | corresponding parts of congruent triangles are congruent |
| Perpendicular line and plane | a line and plane such that they intersect and the line is perpendicular to al lines in the plane that pass through the point of intersection |
| Legs of isosceles triangle | the two congruent sides |
| Base of isosceles triangle | the side of an isosceles that is not a leg |
| Vertex angle of isosceles triangle | the angle opposite the base |
| Hypotenuse of right triangle | the side opposite the right angle |
| Legs of a right triangle | the sides that form the sides of the right angle |
| Median of a triangle | a segment from a vertex to the midpoint of the opposite side |
| Altitude of a triangle | the perpendicular segment from a vertex to the line containing the opposite side |
| Perpendicular bisector of a segment | a line/ray/segment that is perpendicular to the segment at its midpoint |
| Distance from a point to a line | the length of the perpendicular segment from the point to the line |
| Bisector of an angle | the ray that divides the angle into two congruent adjacent angles |
