Chapter 4

4. Triangle a triangle that has a right angle (90°) in it.
5. point where the three angle bisectors meet.
8. Triangle A triangle with all angles equal
11. the point where the perpendicular bisectors of the sides intersect.
14. Triangle A triangle with two equal sides
15. Triangle A triangle that has an angle greater than 90°
16. Lines A set of lines or curves are said to be concurrent if they all intersect.
17. "Sliding" moving a shape without rotating or flipping it.
19. reflected across a line, creating a mirror image.
22. The point where the three medians of the triangle intersect

1. Of Concurrency The point where three or more lines intersect.
2. Angle angle between any side of a shape, and a line extended from the next side.
3. The middle number
6. Bisector A line which cuts a line segment into two equal parts at 90°
7. a line segment connecting a vertex to the line containing the opposite side and perpendicular to that side
9. Angles The common endpoint of two or more rays or line segments
10. The distance from the center to any point on the shape stays the same.
11. Lines A set of lines or curves are said to be concurrent if they all intersect
12. Triangle A triangle with all three sides of equal length.
13. Angles The angle formed by the two equal legs in an isosceles triangle
15. The point where the three altitudes of a triangle intersect
18. Triangle A triangle that has all angles less than 90°
20. Side The common leg of two angles
21. Triangle A triangle with all sides of different lengths