Geometry

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Across
  1. 2. a part of a line. has two endpoints
  2. 3. type of triangle with two equal sides.
  3. 6. shape with five sides. sum of interior angles is 540.
  4. 10. sum of the area of all faces of a shape. three dimensional shape.
  5. 12. when lines don't intersect. in the same plane
  6. 13. two intersecting lines. forms right angles.
  7. 16. a portion of a circle. part of the circumference.
  8. 18. the widest part of a circle. double the radius
  9. 19. Number of cubic units in a shape. three dimensional shape.
Down
  1. 1. the length of the curve of a circle. 2πr
  2. 4. shape with a vertex and circular base. r²πh x 1/3.
  3. 5. number of square units in a shape. two dimensional shape.
  4. 7. type of triangle with all equal sides. all equal angles.
  5. 8. nonadjacent angles from intersecting lines. same value.
  6. 9. a closed shape with straight lines. at least 3 sides
  7. 11. type of triangle with a right angle. two sides are perpendicular
  8. 12. the edge of a shape. a closed boundary.
  9. 14. the distance from the center of the circle. half the diameter
  10. 15. type of triangle with three equal sides. all angles are different.
  11. 17. line segment between two points on a curve. on a circle