Across
- 5. A line, segment, or ray that intersects another segment exactly at its midpoint. It splits the segment into two congruent equal pieces.
- 7. A closed two-dimensional figure formed by three or more straight line segments. Triangles, squares, and hexagons are all examples of this type of figure.
- 8. A triangle that has exactly two sides of equal length. The two angles opposite the equal sides, called base angles, are also equal to each other.
- 10. The point that lies exactly in the middle of a segment, dividing it into two equal parts. It can be found using the midpoint formula with two coordinate points.
- 11. Two lines that lie in the same plane and never intersect no matter how far they extend. They are always the same distance apart and have equal slopes.
- 13. The total distance measured around the outside boundary of a polygon. It is found by adding together the lengths of all the sides of the shape.
- 15. A type of triangle in which all three sides have different lengths. Because the sides are all different, all three interior angles are also different.
- 18. A point that marks the beginning or end of a line segment or ray. A line segment has two of these while a ray only has one.
- 19. Two lines that intersect each other at exactly a 90 degree right angle. The symbol used to show this relationship is a small square at the intersection.
- 20. A straight path made up of points that has no thickness or width. It extends infinitely in both directions and is named by any two points on it.
- 21. A type of angle whose measure is greater than zero degrees but less than 90 degrees. It appears as a sharp, narrow opening compared to a right angle.
- 22. A line that intersects two or more other lines at different points. When it crosses parallel lines, it creates several pairs of special angle relationships.
Down
- 1. A location in space that has no size or shape. It is usually represented by a dot and named with a capital letter.
- 2. A measurable part of a line that consists of two endpoints and all points between them. Unlike a line, a segment has a definite length that can be measured.
- 3. A number or pair of numbers used to describe the location of a point on a number line or coordinate plane. On a two-dimensional plane, every point has an x and a y value.
- 4. A type of angle that measures more than 90 degrees but less than 180 degrees. It looks wider and more open than a right angle.
- 6. A flat surface made up of points that extends indefinitely in all directions. It has no thickness and is named by three non-collinear points or a capital letter.
- 9. A term used to describe points that all lie on the same line. If points do not share the same line, they are called non-collinear.
- 12. A value that represents how far apart two points are on a coordinate plane. It is calculated using the distance formula derived from the Pythagorean theorem.
- 14. A part of a line that starts at one endpoint and extends infinitely in one direction. It is named by its starting point followed by another point on it.
- 16. A term used to describe points that all lie on the same plane. Points that do not share the same plane are called non-coplanar.
- 17. A word used to describe two figures or segments that have the exact same size and shape. Congruent segments are marked with the same number of tick marks in diagrams.