Maths

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Across
  1. 6. If set A is a subset of A that is not equal to A than it is a ...
  2. 7. The distance around the edge of a shape
  3. 8. A number that is being multiplied by the variable.
  4. 9. A line that connects two vertices of a polygon.
Down
  1. 1. A quantity that can be changed and is not fixed.
  2. 2. A point on a polygon where the sides of the object meet.
  3. 3. The longest side of a right triangle.
  4. 4. The point of intersection of all the three medians.
  5. 5. The ... of a set A with a B is the set of elements that are in both set A and B.