geometry vocab

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Across
  1. 1. two angles of a triangle are equal.
  2. 4. uses the equation a^2+b^2=c^2.
  3. 6. a pair of opposite angles formed by intersecting lines.
  4. 8. the amount of space in a certain 3D object.
  5. 10. proportional sides and congruent angles.
  6. 11. An image or shape as it would be seen in a mirror.
  7. 12. outside.
  8. 14. a straight line joining two opposite corners.
  9. 15. all equal sides with four right angles.
  10. 16. having equal angles.
  11. 17. half of a circle.
  12. 19. "caves" in.
  13. 20. half of a sphere.
Down
  1. 2. another word for equal.
  2. 3. a line segment that joins a vertex to the mid-point of the side that is opposite to that vertex.
  3. 5. splits an angle in half.
  4. 7. a line that passes through two lines in the same plane at two distinct points.
  5. 9. the line segment connecting the midpoints of two sides of a triangle.
  6. 13. angle at the base.
  7. 18. having an outline or surface curved like the exterior of a circle or sphere.