Shapes, prepositions and school objects

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Across
  1. 3. a round shape
  2. 4. at the back or rear of something or someone
  3. 5. we use it to cut something
  4. 8. it helps to draw straight lines
  5. 9. s shape with two longer sides and two shorter sides
  6. 10. a shape with four equals sides
Down
  1. 1. a shape with three angles
  2. 2. in the middle of two objects
  3. 6. front of, the opposite of "behind"
  4. 7. it is good for making pencils sharp