Geometry Crossword

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Across
  1. 1. The distance from the center of a circle to any point on its circumference. The formula to find this is r=C/2π
  2. 5. the distance around a circle. The formula to find it is 2πr or πd.
  3. 8. sum of the area of the lateral faces of a figure. This does not include the bases of the figure
  4. 10. the perpendicular distance from the center of a regular polygon to the side of the polygon. It is used to find the area of a regular polygon.
  5. 14. sum of the areas of all the faces of a figure. This does include the bases of the figure
  6. 16. The line directly in the middle of a point in the original and its corresponding point in the image. This is how you determine where a reflection goes
  7. 17. Any angle that is larger than 90 degrees. They also cannot be larger than 180 degrees.
  8. 18. An angle that measures exactly 90 degrees. A rectangle contains four of these.
  9. 20. a polygon that has all sides congruent and all angles congruent. The formula to find the area is A=1/2ap
Down
  1. 2. an angle whose vertex is on the circle and the sides contain chords. The measure of the angle is half of the measure of its arc
  2. 3. the full length of the circle running from the edge, through the midpoint, to the other side. The formula for this is d=2r
  3. 4. an angle with a vertex at the center of a circle and sides that are radii of the circle. The measure of the angle is the same as the measure of its arc.
  4. 6. a function that changes the size of an object without changing its shape. This is a non-rigid movement.
  5. 7. a quadrilateral that only has two sides parallel. The formula to find the area is A=½(b1+b2)h
  6. 9. Polyhedron in which the base is a polygon and the lateral faces are triangles with a common vertex. The formula to find its volume is V=1/3πr^2h
  7. 11. a segment with one endpoint on a circle, one endpoint outside the circle, and one point between the endpoints that intersect the circle. The sides of inscribed angles are usually secant segments
  8. 12. two angles that add up to 180 degrees. Those two angles would make a flat line together
  9. 13. Any angle less than 90 degrees. An equilateral triangle contains three of these.
  10. 15. the amount of space a 3D figure occupies. It uses cubic units, like cm^3
  11. 19. a set of points in space that is a given distance from a point. The formula to find the surface area is SA=4πr^2