CROSSWORD PUZZLE-1

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Across
  1. 4. an angle which measures exactly 90 degrees.
  2. 7. lines that cross at a point.
  3. 9. three-dimensional figure with 6 faces, 8 vertices and 12 edges
  4. 10. graph that uses pictures and symbols to show information
  5. 11. ___ × nine equals 171
Down
  1. 1. lines that are same distance apart and never meet.
  2. 2. side of square whose perimeter is 160 metre
  3. 3. a flat surface that extends indefinetly in all directions.
  4. 5. two line segments of same measure.
  5. 6. estimated quotient of 697/67.
  6. 8. a part of a line with two end points.