Geometric shapes

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Across
  1. 3. A quadrilateral with only one pair of parallel sides
  2. 4. Lines that intersect at 90 degrees
  3. 6. A quadrilateral with opposite sides that are equal, and interior angles that are all 90 degrees
  4. 7. A polygon with four equal sides, interior angles that are each equal to 90 degrees, and diagonals that bisect
  5. 8. A quadrilateral with adjacent sides that are equal, well known as a toy
  6. 9. Angles that add up to 180 degrees
Down
  1. 1. A triangle with two equal sides, and two equal interior angles
  2. 2. A shape with four sides
  3. 5. The half of a diameter