MATHS PUZZLE...!!!

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Across
  1. 3. One of two or more expressions that are multiplied together to get a product
  2. 4. the line segment connecting two non adjacent vertices in a polygon
  3. 5. The side opposite the right angle in a right angle triangle
  4. 8. the point (0,0) on a coordinate plane, where the x-axis and the y-axis connect
Down
  1. 1. A selection in which order is not important
  2. 2. A letter used to represent a number
  3. 6. A closed plane figure made up of several line segments that are joined together
  4. 7. root A square root of x is the number that, when multiplied by itself, gives the number x