Crossword 5

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Across
  1. 5. characteristic of a triangle with two equal sides
  2. 8. a point equidistant from the ends of a line or the extremities of a figure
  3. 10. characteristic of two angles whose sum is a right angle
  4. 12. a polygon with ten sides
  5. 13. a line that touches a curve at only one point
  6. 15. a quadrilateral with one pair of parallel sides
Down
  1. 1. a straight line that intersects a curve at two or more points
  2. 2. a straight line from the center to the perimeter of a circle
  3. 3. ratio of the adjacent side to the hypotenuse of a right-angled triangle
  4. 4. an angle that is always larger than 90° but less than 180°
  5. 6. a solid which has six rectangular faces at right angles to each other
  6. 7. being everywhere equidistant and not intersecting
  7. 9. a closed plane figure bounded by straight sides
  8. 11. at an angle of 90° to a given line, plane, or surface or to the ground
  9. 14. determine the dimensions of something