Across
- 6. The property that states a + b = b + a
- 9. An angle whose measure is greater than 90 degrees
- 11. The set of numbers that includes negative numbers, 0, and positive numbers
- 12. A corner of a polygon (where two lines meet)
- 14. An angle whose measure is less than 90 degrees
Down
- 1. The property that states a + (b + c) = (a + b) + c
- 2. The length of the boundary of a shape
- 3. Change in y divided by the change in x
- 4. An individual surface
- 5. A polygon that has 8 sides
- 7. The measure of a region's size on a surface
- 8. The property that states a(b + c) = axb + axc
- 10. The straight line that forms the border of a shape
- 13. An angle whose measure is exactly 90 degrees