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Geometry 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 19 18 20 Across Down 1. Triangle with two equal sides 5. Has no width and length 7. Point that bisects the segment 8. Two angles whose sum is 90 degrees 11. Points that lie on the same plane 14. Polygon with four sides 2. Two angles whose sum is 180 degrees 3. Non-coplanar lines that never meet 4. Line that connects two non-consecutive side of a polygon 6. Supplementary angles that are also adjacent 9. Polygon with equal sides and equal angles 10. Polygon with nine sides 15. Closed figure with straight sides 17. Four-sided polygon that is both equilateral and equiangular 19. Its length is infinite 20. Means “angle” 12. Four-sided polygon whose sides are all equal 13. With one endpoint and the other has no end 16. Triangle with three acute angles 18. Angle that measures exactly 90 degrees