Terrell's math crossword puzzle

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Across
  1. 2. the measure,in square units, of the interior region of a 2-dimensional figure or the surface of a 3-dimensional figure
  2. 4. a statement that two mathematical expressions are equal
  3. 5. the number of cubic units it takes to fill a solid
  4. 6. the mathematics of the properties and relationships of points,lines,angles,surfaces, and solids
  5. 7. a varible or combination of varibles,numbers,and symbols that represents a mathematical relationship
Down
  1. 1. the ratio of the lengths of correponding sides of two similar figures
  2. 3. the ratio of the circumference of any circle to its diameter,approximately equal to 3.14
  3. 5. a quanity that can have different values