chapter 6-7

2. a four-sided, or quadrilateral, geometric figure in which all four sides are of the same length and each of the two pairs of opposite sides are parallel to each other
5. a line that passes through two very specific points on a triangle: a vertex, or corner of a triangle, and its opposite side at a right, or 90-degree, angle
6. has all its sides equal
10. the center of mass of a geometric object of uniform density.
12. the point where the triangle's three perpendicular bisectors intersect.
13. the point where all three altitudes of the triangle intersect
16. a line that splits an angle into two equal angles
17. a type of quadrilateral that has its parallel sides equal to each other and all the four vertices are equal to 90 degrees.
18. quadrilaterals that have two parallel sides and two non-parallel sides

1. a two-dimensional geometrical shape whose sides are parallel to each other
3. a four-sided regular polygon which is also known as a quadrilateral with four equal sides
4. a quadrilateral with reflection symmetry across one of its diagonals
7. a point which is at the same or equal distance from two given points
8. a line segment joining a vertex to the midpoint of the opposite side,
9. the intersection point of all the three interior angle bisectors of the triangle
11. a line that connects two vertices of a polygon or a solid, whose vertices are not on the same edge
14. a polygon whose vertex angles are equal
15. Bi sector a line that intersects another line segment perpendicularly and divides it into two parts of equal measurement