Across
- 2. the length of the closed curve of a circle
- 4. a continuous portion of a circle
- 6. a surface generated by rotating a line around a fixed line
- 8. triangle a three-sided regular polygon
- 11. triangle a triangle whose interior angles are all acute
- 12. a round three-dimensional closed surface
- 14. a four-sided polygon
Down
- 1. triangle a triangle with two equal sides
- 3. angles two angles whose sum is a right angle
- 4. elevation above sea level or above the earth's surface
- 5. in or near an inner area
- 7. a quantity obtained by the addition of a group of numbers
- 9. angle an angle less than 90 degrees but more than 0 degrees
- 10. combination of three or more notes that blend harmoniously
- 13. a straight line from the center to the perimeter of a circle