Triangles

1. this type of triangle has all angles with measures less than 90 degrees
4. a segment from a vertex to the line containing the opposite side and perpendicular to the line containing that side
5. the point where concurrent lines interest
6. when three or more lines intersect at a common point
7. these are formed by one side of the triangle and the extension of an adjacent side
9. the angle with sides that are the legs of an isosceles triangle
10. the two congruent sides of an isosceles triangle
13. a segment with endpoints being a vertex of a triangle and the midpoint of the opposite side
16. the angle formed by two adjacent sides of a polygon
19. a bisector that is also perpendicular to a segment
21. a line, ray, or segment that splits an angle into two congruent parts
23. the point of concurrency made by angle bisectors

2. the point of concurrency made by perpendicular bisectors
3. the point of concurrency made by medians
6. also known as matching parts
8. the inside angles of a triangle
11. the two angles formed by the base and the congruent sides of an isosceles triangle
12. the side located between two consecutive angles of a polygon
14. the point of concurrency made by altitudes
15. if all parts of one polygon are congruent to all the matching parts of another polygon, then the two are___________
17. this type triangle has all congruent sides and congruent angles
18. this type triangle has one angle with a measure greater than 90 degrees
20. the ______ of the measures of the angles of a triangle is 180
22. this type triangle has one angle with a measure of 90 degrees