Lines, angles, triangles, quadrilaterals, triangle congruence shortcuts
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| 574798170 | Congruent | when two parts of a geometric figure have the same measure | |
| 574798171 | Corresponding | geometric items that are in the same position in different figures | |
| 574798172 | Vertical angles | a must be equal to b. |  |
| 574798173 | Reflexive property of equality | This reason is used to help prove congruence when one side or angle that is part of two triangles has a measure that is equal to itself. SAME side or angle! | |
| 574798174 | Complementary angles | Two angles which add up to 90 degrees |  |
| 574798175 | Supplementary angles | Two angles which add up to 180 degrees |  |
| 574798176 | Angle-Angle-Angle (AAA) | does NOT prove triangles congruent; DOES show that triangles are SIMILAR | |
| 574798177 | Angle-Side-Angle (ASA) | DOES prove triangles congruent when two adjacent angles and the included side are congruent |  |
| 574798178 | Angle-Angle-Side (AAS) | DOES prove triangles congruent when two adjacent angles and the following side are congruent |  |
| 574798179 | Side-Angle-Side (SAS) | Pair 4 shows that when two adjacent sides and the included angle are congruent, the triangles are congruent. |  |
| 574798180 | Side-Angle-Angle (SAA) | Pair 3 shows that when two adjacent angles and the following side are congruent, the triangles are congruent. Referred to as AAS |  |
| 574798181 | Side-Side-Angle (SSA) | does NOT prove triangles congruent | |
| 574798182 | Side-Side-Side (SSS) | When all three sides are congruent, the triangles may be said to be congruent. |  |
| 574798183 | acute triangle | exactly 3 acute angles |  |
| 574798184 | obtuse triangle | exactly 1 obtuse angle |  |
| 574798185 | right triangle | exactly 1 right angle |  |
| 574798186 | scalene triangle | no equal sides |  |
| 574798187 | isosceles triangle | exactly 2 equal sides |  |
| 574798188 | equilateral triangle | all equal sides |  |
| 574798189 | sum of angles in a triangle | 180 degrees | |
| 574798190 | sum of angles in a quadrilateral | 360 degrees | |
| 574798191 | quadrilateral | a shape with 4 sides | |
| 574798192 | rectangle | a quadrilateral that has 4 right angles |  |
| 574798193 | rhombus | a parallelogram with all 4 sides equal |  |
| 574798194 | square | a rectangle with all 4 sides of equal length |  |
| 574798195 | trapezoid | a quadrilateral with exactly one pair of parallel sides |  |
| 574798196 | parallelogram | a quadrilateral that has 2 pairs of parallel sides |  |
| 574798197 | Acute Angle |  | |
| 574798198 | Acute Angle | An angle less than 90 degrees | |
| 574798199 | Obtuse Angles |  | |
| 574798200 | Obtuse Angle | An angle between 90 and 180 degrees | |
| 574798201 | Right Angle |  | |
| 574798202 | Right Angle | An angle that is exactly 90 degrees | |
| 574798203 | Straight Angle |  | |
| 574798204 | Straight Angle | An angle that is exactly 180 degrees | |
| 574798205 | Line Segment | Has two end points | |
| 574798206 | Line Segment |  | |
| 574798207 | Ray | Has one end point and continues forever in other direction | |
| 574798208 | Ray |  | |
| 574798209 | Line | A straight line having at least two points that continue forever | |
| 574798210 | Line |  | |
| 574798211 | Corresponding Angles | Same side of transversal and same size |  |
| 574798212 | vertical angles | These angles are formed by two intersecting lines and have the same measure. |  |
| 574798213 | alternate interior angles | angles are on opposite sides of the transversal and on the inside of the given lines |  |
| 574798214 | alternate exterior angles | outside the two parallel lines and opposite sides of transversal |  |
| 574798215 | Supplementary Angles | Two angles with a sum of 180 degrees |  |
| 574798216 | Complementary Angles | Two angles with a sum of 90 degrees |  |
| 574798217 | transversal | A line that intersects two or more lines. |  |
