geometry

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Across
  1. 1. All its angles=180
  2. 5. An angle that measures less than 90°
  3. 7. A rectangle with 4 equal sides
  4. 8. the intersection point of two sides of a plane figure
  5. 9. Distance around a circle (the perimeter)
  6. 10. Triangle A triangle that has one obtuse angle
  7. 13. Lines in a plane that never intersect
  8. 14. Lines that cross at exactly one point
  9. 16. Two geometric objects having the same measure.
  10. 17. The distance around a figure.
  11. 20. An eight-sided polygon.
  12. 21. A six-sided polygon.
Down
  1. 2. A figure formed by two line segments or rays with a common endpoint.
  2. 3. a triangle with all sides equal and all angles equal
  3. 4. Two lines that intersect to form four right angles
  4. 6. A four-sided polygon.
  5. 11. A straight one-dimensional figure having no thickness and extending infinitely in both directions.
  6. 12. An angle that measures 90°
  7. 13. A location in space – a dot on a piece of paper
  8. 15. A segment that connects two nonadjacent vertices of a polygon.
  9. 18. A line segment with one endpoint at the center of a circle and the other endpoint on the circle
  10. 19. A series of connected line segments that starts and ends at the same place and does not intersect itself anywhere in between.