Geometry

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Across
  1. 3. a portion of the circumderence of a circle
  2. 5. the ratio of an acute angle in a right triangle; the ratios is the measure of the adjacent side over the hypotenuse
  3. 6. the ratio of an acute angle in a right triangle; the ratio is the measure of the opposite side over the adjacent side
  4. 8. the distance from the center to any side of a regular polygon
  5. 9. a rule that is accpted without proof
Down
  1. 1. an unproven statement that is based on observations
  2. 2. the point of concurrency of the angle bisectors of a triangle
  3. 3. the perpendicular segment from a vertex of a triangle to the opposite side
  4. 4. a line that intersects a circle in two points
  5. 7. a parallelogram with four congruent sides