Across
- 1. A polygon that is equilateral and equiangular.
- 11. An angle whose measure is more than 90° and less than 180°.
- 14. A two-dimensional shape in which all points on the curved line are equidistant from a center point.
- 15. A triangle with three acute angles.
- 18. Two lines that intersect to form a right angle.
- 19. A collection of points along a straight path that extends endlessly in both directions.
- 20. A proof in which you prove that a statement is true by first assuming that its opposite is true. If this assumption leads to an impossibility, then you have proved that the original statement is true.
- 23. A closed figure with six sides.
- 24. The point of concurrency of the angle bisectors of a triangle.
- 25. A quadrilateral with both pairs of opposite sides parallel.
- 28. A triangle with one right angle.
- 32. Two lines that meet to make a corner.
- 33. A two-dimensional, closed, four-sided figure with four right angles.
- 34. The perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side.
- 36. Identical in size and shape.
- 37. A special type of rectangle that has equilateral (same length) sides and parallel opposite sides.
- 38. A plane figure that meets the following two conditions. 1. It is formed by three or more segments called sides, such that no two sides with a common endpoint are collinear. 2. Each side intersects exactly two other sides, one at each endpoint.
- 40. A figure formed by three segments joining three noncollinear points, called vertices.
- 41. A closed figure with seven sides.
- 42. Sides that are the same length.
- 44. The point of concurrency of the lines containing the altitudes of a triangle.
- 47. A segment, ray, line, or plane that is perpendicular to a segment at its midpoint.
- 48. A triangle with three congruent angles.
Down
- 2. A ray that divides an angle into two adjacent angles that are congruent
- 3. The point of concurrency of the perpendicular bisectors of a triangle.
- 4. A triangle with at least two congruent sides.
- 5. A polygon such that no line containing a side of the polygon contains a point in the interior of the polygon.
- 6. A line that intersects two or more coplanar lines at different points.
- 7. A part of a line having two endpoints.
- 8. Two lines in the same plane that do not intersect.
- 9. A triangle with one obtuse angle.
- 10. Three or more lines that intersect in the same point.
- 12. A triangle with no congruent sides.
- 13. An angle whose measure is less than 90°.
- 16. A triangle with three congruent sides.
- 17. Points that lie on the same plane.
- 21. A statement that can be proven
- 22. Two angles with equal measure formed by two intersecting lines.
- 26. A continuous portion of a circle
- 27. A closed figure with eight sides.
- 29. A closed figure with five sides.
- 30. A flat surface that extends endlessly in all directions.
- 31. The point of concurrency of the medians of a triangle.
- 35. A closed four-sided figure with parallel opposite sides. A square is a special kind of rhombus. Sometimes called a diamond.
- 39. Points that lie on the same line.
- 41. Two lines that do NOT intersect and are NOT coplanar.
- 43. A specific position on a line, plane, or in space.
- 45. A part of a line having only one endpoint.
- 46. Line segments in geometric figures that compose the exterior of the object.