15 words of vocabulary about geometry

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Across
  1. 3. identical in form, coinciding exactly when superimposed
  2. 4. a quadrilateral all of whose sides have the same legth
  3. 7. a triangle in which all three sides are of different length
  4. 8. each angular point of a polygon, polyhedron, or other figure
  5. 9. a ratio that represents the relationship between the dimensions of a model and the corresponding dimensions on the actual figure or object
  6. 10. a line segment that connects or joins two points on a circle's circumference
  7. 11. a line from the centre to the circumference of a circle
  8. 13. a line that divides a given line segment exactly into two halves forming a 90 degrees angle
  9. 14. the vertical (y) value in a pair of coordinates
Down
  1. 1. an instrument for mesuring angles
  2. 2. a point equidistant from the ends of a line
  3. 5. a solid having four plane triangular faces
  4. 6. a quadrilateral having two sides parallel
  5. 7. instrument for measuring right angles
  6. 12. in a triangle, a line that cuts one of the sides at right angles and passes through the opposite vertex of the triangle