geometry words

3. the length of the closed curve of a circle
5. A straight one-dimensional figure having no thickness and extending infinitely in both directions.
8. A set of points on a line consisting of two endpoints and all the points between them.
10. a combination of three or more notes that blend harmoniously
11. in or near an inner area
13. a plane curve with every point equidistant from the center
14. the length of a straight line through the center of a circle
16. a shape with a circular base and sides tapering to a point
17. an angle less than 90 degrees but more than 0 degrees
18. ratio of the adjacent side to the hypotenuse of a right-angled triangle

1. a three-sided regular polygon
2. the space between two lines or planes that intersect
3. of equal importance, rank, or degree
4. corresponding in character or kind
6. a specific identifiable position in a continuum or series
7. the property created by the space between two objects
9. an area that is in the middle of some larger region
10. lying in the same plane
11. two angles whose sum is a right angle
12. a triangle whose interior angles are all acutealtitude elevation above sea level or above the earth's surface
15. a surface generated by rotating a line around a fixed line