Quadrilateral Puzzle

6. two angles that sum up to 180°.
8. a straight one-dimensional figure.
9. meaning equal in terms of shape and size.
11. a polygon with two sides.
14. a line segment connecting the opposite vertices.
15. a branch of mathematics that deals with the properties, measurement, and relationships of points, lines, angles.

1. a polygon with three edges and three vertices.
2. when two lines do not intersect.
3. when an intersection forms right angles.
4. all four sides are equal.
5. to cut or divide something into two equal parts.
7. a quadrilateral with two pairs of parallel sides.
10. a closed figure made up of line segments.
12. a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
13. segment a section or part of a straight line that has two distinct end points and contains every point on the line between them