First Quarter - Project in Mathematics (Geometry)

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Across
  1. 2. The perimeter of a circle.
  2. 5. Points that lie on the same plane.
  3. 7. Two lines, vectors, planes, etc. that intersect at a right angle.
  4. 8. A triangle that has a right angle.
  5. 9. For a given angle, the angle that when added to it totals 180 degrees.
  6. 10. A triangle with (at least) two sides of equal length, and therefore also with (at least) two equal angles.
  7. 11. The amount of rotation about the point of intersection of two lines or line segments that is required to bring one into correspondence with the other.
  8. 12. A polygon with four sides of equal length and at right angles to each other.
  9. 13. A four-sided polygon.
  10. 14. The branch of mathematics that studies figures, objects, and their relationships to each other.
  11. 15. A line that cuts across two or more (usually parallel) lines.
  12. 18. That portion of geometry dealing with solids, as opposed to plane geometry.
  13. 22. Three or more points that lie on the same line.
  14. 23. A two-dimensional figure that consists of a collection of line segments, joined at their ends.
  15. 24. A pyramid with a circular cross section.
  16. 25. A Platonic solid consisting of six equal square faces that meet each other at right angles.
Down
  1. 1. Any segment, ray, or line that divides an angle into two congruent angles.
  2. 2. A line segment connecting two points on a circle.
  3. 3. The set of all points equal in distance from a center point.
  4. 4. A line intersecting a circle at exactly one point.
  5. 5. A pair of angles whose measures add up to 90 degrees.
  6. 6. An angle that measures greater than 90 degrees and less than 180 degrees.
  7. 10. Point of concurrency of the three angle bisectors of the triangle.
  8. 11. A line segment from a vertex of a triangle which meets the opposite side at a right angle.
  9. 16. An angle that measures less than 90 degrees.
  10. 17. The longest side of a right triangle
  11. 19. Eight sided shape.
  12. 20. The point on a line segment that divides it into two segments of equal length.
  13. 21. A three-sided (and three-angled) polygon.
  14. 23. A zero-dimensional mathematical object that can be specified in n-dimensional space using n coordinates.