Geometry

3. when the sides of a polygon are extended, other angles are formed. The angles that form linear pairs with the interior angles.
5. A type of triangle that has 2 congruent sides, and 2 congruent base angles
7. Straight lines the intercept or meet at an right angle
12. 2 angles that are equal to 180 degrees or two angles that add up to 180 degrees
14. Angles pairs formed on opposite sides of a line that intersects two other lines
15. A classification of a triangle that has one angle that is exactly 90 degrees
16. 2 angles that are equal to 90 degrees or two angles that are added up to equal 90 degrees
18. A type of triangle that has 3 congruent angles, and is a perfect triangle
19. The branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids.

1. A polygon with three sides. They can have vertices named A, B, C "ABC"
2. A theorem where the sum of the measures of the interior angles of a triangle is 180 degrees
4. A classification of a triangle that angles are less than 90 degrees
6. A figure where all interior angles are equal in measure
8. A theorem that is a statement that can be proved easily using the theorem
9. A classification of a triangle that has one angle that is greater than 90 degrees
10. The original angles that are in the inside, the angles that were on the first line
11. A type of triangle that has no congruent sides, and no congruent angles
13. Identical triangles that have all 3 of the same angles and same sides
17. Straight lines that never intercept or touch,keeping a constant distance apart, no matter how far they go