Geometry Crossword

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Across
  1. 1. Non-empty intersection of a solid body in three-dimensional space with a plane
  2. 3. Set of all points that share a property
  3. 5. Segment that connects the midpoints of two sides of a triangle
  4. 7. The perimeter of a circle or ellipse
  5. 12. When two or more objects share the same center
  6. 14. Portion of a curve/circle
  7. 15. When several points share the same plane they are said to be...?
  8. 16. A transformation representing a flip of a figure
  9. 18. The perpendicular segment from a vertex of a triangle to the opposite side (or base)
  10. 19. Line that passes through two lines in the same plane at two distinct points
  11. 20. A polygon whose vertex angles are equal
Down
  1. 2. A polygon that is curved, rounded, or pointed outward
  2. 4. When two objects have the same shape and size they are...?
  3. 6. A pair of non-adjacent angles formed when two lines intersect
  4. 8. Straight line segment whose endpoints both lie on a circular arc
  5. 9. Type of triangle that has two sides of equal length
  6. 10. A quadrilateral that has four equal sides and four equal angles
  7. 11. 3 or more points are said to be ______ if they fall on the same line
  8. 13. 3 acute angles make an...?
  9. 17. Half of a circle is called a...?