Geometry

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Across
  1. 1. a three-sided polygon with a sum of 180° in the angle measures
  2. 3. lines that intersect at a 90° angle
  3. 5. when two figures are the same shape and have proportional sides and congruent angles
  4. 7. the distance around a circle
  5. 9. lines that are equal distance from each other at all points and never intersect
Down
  1. 2. the distance from the center of the circle to a point on the circle
  2. 4. the distance from one endpoint to another that passes through the center of a circle
  3. 6. the covering of a two-dimensional shape; square units
  4. 8. figures having the same size and shape