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Across 1. a many sided figure 3. measure is 180 4. common vertex and congruent 8. starts at on point and goes forever 9. two adjacent angles 12. measure is 90 16. perimeter of a circle 17. if----then 18. ( 0 , 0 ) 19. comes from the Greek word meaning - land measurement

Down 1. a rule accepted without proof 2. if a = b and b = c then a= c 5. four sided: one pair of parallel sides 6. the amount of surface 7. always equi-distant apart 10. intersect and 90 11. both pair of opposite sides are equal 13. adjacent sides are congruent and oppoing sides are not 14. the interval between two events 15. middle of a segment