Triangles

5. The center of the gravity for the triangle, where the medians meet. The distance from the vertex to the centroid is 2/3 the length of the median.
6. has no size; length, width, or height. It is represented by a dot and named by a capital letter.
9. concurrency of altitudes
11. Equals sum of the two remote interior angles
13. a point that divides the segment into two congruent segments.
14. concurrency of angle bisectors
17. the statement formed by exchanging the hypothesis and the conclusion of a conditional statement.
18. triangle with at least two sides congruent.
19. ray that divides an angle into two congruent adjacent angles.
20. segment from the vertex of a triangle perpendicular to the line containing the opposite side.
22. two angles whose sum is 90 degrees.
23. two angles whose sum is 180 degrees.

1. three or more lines in a plane that intersect at a single point.
2. segment of a triangle that intersects the side of a triangle at the midpoint, creating a right angle.
3. ___________ Theorem - in a right triangle, the sum of the squares of the legs is equal to the square of the hypotenuse
4. angle whose measure is 90 degrees.
5. concurrency of perpendicular bisectors
6. two lines are parallel if they are coplanar and do not intersect.
7. two angles with equal measure formed by two intersecting lines.
8. same distance
10. angle whose measure is greater than 90 degrees but less than 180 degrees.
12. triangle with all sides congruent.
15. segment from the vertex of a triangle to the midpoint of the opposite side
16. two lines that intersect to form right angles.
21. angle whose measure is between 0 degrees and 90 degrees.