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Across 1. the distance halfway across a circle 6. the average 7. an angle measuring exactly 180 degrees 10. an angle measuring greater than 90 degrees 11. measured in units squared 12. perimeter of a circle 14. the opposite operation 16. two angles that add up to 180 degrees 17. two angles that add up to 90 degrees 18. any number on a number line

Down 2. the distance across a circle 3. The distance a number is from the zero on a number line 4. the distance around a shape 5. an angle measuring exactly 90 degrees 8. the number that appears the most in a set of numbers 9. the amount inside a 3-D object 11. an angle measuring less than 90 degrees 12. the number in front of a variable 13. the middle number in a set when ordered least to greatest 15. a letter that represents a number