| A | B |
|---|
| Triangle | A figure formed by three line segments |
| Sides | The line segments that form a figure |
| Vertex | The point at which two line segments intersect |
| Vertices | More than one vertex |
| Interior | All points inside a figure |
| Exterior | All points outside a figure |
| Equilateral Triangle | A triangle with all three sides of equal length |
| Isosceles Triangle | A triangle with at least two sides of equal length |
| Scalene Triangle | A triangle with no equal sides |
| Right Triangle | A triangle with one right angle |
| Acute Triangle | A triangle with three acute angles |
| Obtuse Triangle | A triangle with one obtuse angle |
| Congruent Triangles | Triangles that have the same size & shape |
| Corresponding Parts | A side or an angle of one triangle that is exactly the same size as a side or angle of another triangle |
| SSS Postulate | If 3 sides of one triangle are congruent with 3 sides of another, the triangles are congruent. |
| SAS Postulate | If two sides and the angle in between are congruent to corresp. parts of another triangle, they are congruent. |
| ASA Postulate | If two angles and the side in between are congruent to corresp. parts of another triangle, they are congruent. |
| Legs | The sides of a right triangle that form the rt. angle |
| Hypotenuse | The side of a rt. triangle opposite the rt. angle |
| Pythagorean Theorem | The sum of the squares of the legs of a right triangle is equal to the square of the hyp. |
| Similar Triangles | Two triangles with congruent angles & proportionate sides |
| Ratio | a fraction; a comparison of two numbers |
| Proportion | An equation stating two ratios are equal |
| Inequality | A statement that two expressions are not equal |
| Triangle Inequality Theorem | The sum of any two sides of a triangle is > the third side. |
