Understanding Elementary shapes

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Across
  1. 5. less than one fourth of the revolution
  2. 7. The distance between the end points of a line segment is its length.
  3. 8. we use to measure the size of an angle in degrees.
  4. 10. two intersecting lines are ____ if the angle between them is 90 degree.
  5. 11. all three side equal polygon.
Down
  1. 1. half of a revolution
  2. 2. 1/4 revolution
  3. 3. When the sum of the measure of two angles is that of a right angle,then each one of them is ___.
  4. 4. A rhombus with 4 right angles
  5. 6. polygon having 8 sides
  6. 8. polygon with 5 sides
  7. 9. More than half revolution