Chapter 6-7 Vocab

4. a quadrilateral, a closed flat geometric shape in which two sets of neighboring or adjacent sides are congruent
6. a four-sided shape that has one pair of sides parallel
8. a ray or a line that divides an angle into two equal parts
11. the point where all three altitudes of the triangle intersect
13. having all or corresponding angles equal
14. the intersection point of all the three interior angle bisectors of the triangle
16. a line that passes through the vertex, or corner of a triangle, and its opposite side at a 90-degree angle
17. a quadrilateral with four equal sides and four right angles
18. the point of intersection between the three perpendicular bisectors of the triangle's sides

1. Bisector a line that bisects another line segment at a right angle, through the intersection point
2. a line segment connecting the opposite vertices (or corners) of a polygon
3. a special kind of quadrilateral in which the opposite sides are parallel and equal
5. a line segment joining a vertex to the midpoint of the opposite side, thus bisecting that side
7. the centre point of the object
9. a four-sided shape whose corners are all ninety-degree angles
10. all sides are the same length
12. the same or equal distance
15. parallelogram whose all sides are equal and diagonals intersect each other at 90 degrees