Area of Quadrilaterals and Triangles

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Across
  1. 4. the number of unit squares that cover the surface of a closed shape
  2. 6. lines that are equal distance apart and never touching
  3. 7. a triangle that has a 90 degree angle
  4. 8. a quadrilateral with only one pair of parallel lines
  5. 9. a quadrilateral with two pairs of parallel sides
  6. 11. side of a parallelogram that describes the length, and is perpendicular to the height line
  7. 12. a shape with 4 equal distance lines and 4 vertices
  8. 13. a point of a shape where two lines meet to create an angle
Down
  1. 1. An angle that has the measurement of 90 degrees
  2. 2. a shape with 4 sides, 2 different sets of parallel lines, and 4 vertices
  3. 3. a shape with 4 sides and 4 vertices
  4. 5. the perpendicular distance between a set of perpendicular bases
  5. 9. lines that intersect creating a 90 degree right angle
  6. 10. a shape with 4 equal sides, a pair of obtuse angles, and a pair of acute angles
  7. 14. a shape with 3 sides and 3 vertices