Across
- 2. / The point halfway between two given points
- 4. / An angle that has measure less than 90°
- 8. / All points between two given points (including the given points themselves).
- 9. / Two rays sharing a common endpoint. Angles are typically measured in degrees or radians.
- 10. / At a 90° angle. Note: Perpendicular lines have slopes that are negative reciprocals.
- 11. / A triangle with two sides that are the same length. Formally, an isosceles triangle is a triangle with at least two congruent sides.
- 12. / A triangle which has a right (90°) interior angle.
- 13. / A 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 line, segment, or ray that passes through a midpoint of another segment
- 17. / 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. Note: If the figure is a curve or surface, the vertices are the points of maximum curvature.
- 18. / The side of a right triangle opposite the right angle. Note: The hypotenuse is the longest side of a right triangle.
- 20. / A 90° angle.
- 22. / The locus of all points that are a fixed distance from a given point.
- 24. / 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
- 26. / 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. Note: Congruent segments, sides, and angles are often marked.
- 27. / The geometric figure formed by two points. A line is the straight path connecting two points and extending beyond the points in both directions.
- 28. / 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.
Down
- 1. / A line or ray that divides an angle in half. For polygons, an angle bisector is a line that bisects an interior angle. Note: The angle bisectors of a triangle are concurrent and intersect at the incenter.
- 3. / A triangle with three congruent sides. Note: An equilateral triangle is also equiangular. In Euclidean geometry, the angles of an equilateral triangle each measure 60°.
- 5. / A polygon with three sides.
- 6. / Half a circle. That is, a 180° arc.
- 7. / Two angles in a plane which share a common vertex and a common side but do not overlap. Angles 1 and 2 below are adjacent angles.
- 10. / Two distinct coplanar lines that do not intersect. Note: Parallel lines have the same slope.
- 14. / An angle that has measure more than 90° and less than 180°.
- 15. / For a right triangle it refers to a side other than the one opposite the right angle
- 16. / A triangle with two sides that are the same length. Formally, an isosceles triangle is a triangle with at least two congruent sides.
- 19. / A polygon for which all sides are congruent and all angles are congruent.
- 20. / A part of a line starting at a particular point and extending infinitely in one direction.
- 21. / The geometric figure formed at the intersection of two distinct lines.
- 23. / A line segment between the center and a point on the circle or sphere. The word radius also refers to the length of this segment.
- 25. / A 180° angle.