Math Vocab

10. Lines that never meet and are always the same distance apart
11. Angles formed outside a polygon when a side is extended.
13. Two angles whose measures add up to 90°
14. A logical argument using definitions, theorems, and properties to show a mathematical statement is true.
15. An angle that measures exactly 90°.
18. In a right triangle, the two sides that form the right angle.
19. If two angles of one triangle are equal to two angles of another triangle, the triangles are similar.
20. A triangle with no equal sides or angles.
21. An angle that measures more than 90° but less than 180°.
23. Lines that intersect to form a right (90°) angle.
24. A triangle with at least two equal sides and angles.

1. Angles opposite each other when two lines intersect; always equal.
2. If the square of one side of a triangle equals the sum of the squares of the other two sides, then the triangle is a right triangle.
3. Angles in matching corners when two lines are crossed by a transversal
4. Angles inside a polygon.
5. A triangle with one obtuse angle.
6. Two angles whose measures add up to 180°.
7. An angle that measures less than 90°
8. The longest side of a right triangle, opposite the right angle.
9. A triangle where all three angles are less than 90°
12. The square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.
16. A line that crosses two or more lines.
17. A shape where all angles are equal
19. The total measure of angles in a shape
22. Two angles or sides that share a common side or vertex.