Across
- 1. The locus of all points that are a fixed distance from a given point.
- 4. A polygon for which all sides are congruent and all angles are congruent.
- 5. The geometric figure formed at the intersection of two distinct lines.
- 7. A triangle for which all three sides have different lengths.
- 9. A triangle with three congruent sides.
- 11. closed plane figure for which all sides are line segments. The name of a polygon describes the number of sides. A polygon which has all sides mutually congruent and all angles mutually congruent is called a regular polygon.
- 16. A 90° angle.
- 18. A line or ray that divides an angle in half. For polygons, an angle bisector is a line that bisects an interior angle
- 21. A triangle with two sides that are the same length. Formally, an isosceles triangle is a triangle with at least two congruent sides.
- 23. Half a circle. That is, a 180° arc.
- 24. The side of a right triangle opposite the right angle.
- 25. Two distinct coplanar lines that do not intersect.
- 26. A flat surface extending in all directions. Any three noncollinear points lie on one and only one plane. So do any two distinct intersecting lines. A plane is a two-dimensional figure.
- 28. A corner point of a geometric figure. For a polygon, vertices are where adjacent sides meet. For an angle, the vertex is where the two rays making up the angle meet.
- 29. At a 90° angle. Note: Perpendicular lines have slopes that are negative reciprocals.
- 31. All points between two given points (including the given points themselves).
Down
- 2. Exactly equal in size and shape. Congruent sides or segments have the exact same length. Congruent angles have the exact same measure. For any set of congruent geometric figures, corresponding sides, angles, faces, etc. are congruent.
- 3. A 180° angle.
- 6. An angle that has measure less than 90°.
- 8. Two angles in a plane which share a common vertex and a common side but do not overlap.
- 10. The geometric figure formed by two points. A line is the straight path connecting two points and extending beyond the points in both directions.
- 12. A polygon with three sides.
- 13. The point halfway between two given points.
- 14. a line segment extending from the center of a circle or sphere to the circumference or bounding surface.
- 15. Two rays sharing a common endpoint. Angles are typically measured in degrees or radians.
- 17. A part of a line starting at a particular point and extending infinitely in one direction.
- 19. An angle that has measure more than 90° and less than 180°.
- 20. A line segment between two points on the circle or sphere which passes through the center. The word diameter is also also refers to the length of this line segment.
- 22. A line, ray or segment which cuts another line segment into two equal parts.
- 27. a side other than the one opposite the right angle
- 30. A 90° angle.