Angles and Shapes

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