Geometry

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Across
  1. 4. lines that never meet, no matter how far they extend
  2. 6. lines that intersect at a 90-degree angle
  3. 8. lines that go straight up and down
  4. 9. a tool to draw circles or arcs
  5. 12. a line that divides something into two equal parts
Down
  1. 1. a shape with four equal sides and four right angles
  2. 2. a quadrilateral with opposite sides parallel and equal in length
  3. 3. formed by two rays sharing a common endpoint
  4. 5. the middle point of a circle
  5. 7. a quadrilateral with four equal sides but no right angles
  6. 9. a round shape with all points equidistant from the centre
  7. 10. a quadrilateral with four right angles and opposite sides equal
  8. 11. a quadrilateral with only two parallel sides