Angles and Shapes

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Across
  1. 3. the cross section of a cylinder
  2. 5. a four-sided shape with one pair of parallel lines
  3. 6. angles are greater than ninety degrees but less than one hundred and eighty degrees
  4. 7. angles are ninety degrees
  5. 9. angles that are greater than one hundred and eighty degrees
  6. 10. a closed figure with three lines
  7. 11. line segments that do not cross each other
  8. 12. a four-sided shape whose all sides are the same and form right angles
Down
  1. 1. within the triangle
  2. 2. angles are less than ninety degrees
  3. 3. has straight parallel lines and two circular cross section
  4. 4. angles that are like lines
  5. 8. a four-sided shape that has two pairs of parallel lines and form right angles
  6. 13. in the circle, are the half of diameters