Math vocabulary

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Across
  1. 3. the standard unit to measure the length
  2. 6. the standard unit for measuring capacity.
  3. 7. when the sum of two angles is 90
  4. 11. the only prime number which is also even.
  5. 12. I am neither prime nor composite
  6. 13. Two angles which lie side by side such that one of their arms and the vertex is common.
  7. 15. when the sum of two angles is 180
  8. 17. two numbers that have only 1 as a common factor are known as _____ numbers
  9. 18. I am a pictorial representation.
Down
  1. 1. The sum of the measure of all the sides.
  2. 2. corner of the triangle
  3. 4. I am measured in the cubic units.
  4. 5. an angle less than 180 but more than 90
  5. 8. A fraction with numerator less than the denominator.
  6. 9. A fraction with a combination of a whole number and a proper fraction.
  7. 10. an angle more than 0 but less than 90
  8. 14. Space occupies by a flat shape.
  9. 16. triangle with all three sides are equal