Tucks Crossword

5. a location.
7. a line with a single endpoint that extends infinitely in one direction.
8. a statement that is assumed to be true based on basic geometric principles.
11. a quadrilateral with two pairs of parallel sides.
12. a flat surface on which a straight line joining any two points on it would lie.
14. the middle point of a line segment.
16. the total length around the outside of a shape.
17. a triangle that has two sides of equal length.
21. when both the hypothesis and conclusion of a conditional statement are invalid.
22. the distance around the boundary of a circle.
23. a triangle in which all three sides have the same length.
24. the total space taken up by a flat surface or shape of an object.

1. an angle which is greater than 90 degrees and less than 180 degrees.
2. an angle that measures 90 degrees.
3. the space between two lines at the point where they meet.
4. a two-dimensional shape with four sides, four vertices, and four angles.
6. a statement that is the opposite of a conditional statement.
9. a long, narrow mark.
10. a quadrilateral with both pairs of opposite sides parallel and all sides the same length.
13. at an angle of 90° to a given line, plane, or surface.
15. two lines that never meet.
18. a part of a straight line that is bounded by two distinct end points.
19. an angle which is less than 90 degrees.
20. a triangle in which all three sides are different lengths, and all three angles are of different measures.