Geometry Terms

1. .
4. the highest point; the top or apex.
7. at an angle of 90° to a given line, plane, or surface.
9. of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening.
11. long, narrow mark or band.
12. in agreement or harmony.
13. An angle is formed when two straight lines or rays meet at a common endpoint.
15. a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.
17. a group of (typically three or more) notes sounded together, as a basis of harmony.
18. each of the parts into which something is or may be divided.

1. a flat surface on which a straight line joining any two points on it would wholly lie.
2. quality of being made up of exactly similar parts facing each other or around an axis.
3. resembling without being identical.
4. the amount of space that a substance or object occupies, or that is enclosed within a container, especially when great.
5. a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).
6. tapered, sharp end of a tool, weapon, or other object.
8. a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
10. (of lines, planes, surfaces, or objects) side by side and having the same distance continuously between them.
11. the extent or measurement of a surface or piece of land.
14. the ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine.
16. a portion of the boundary of a circle or a curve.