Redo Vocabulary Test

Definitions

3.Point – exact location in a space 4.Line – straight path of points that goes on forever in two directions 5.Line segment – part of a line with two endpoints 6.Midpoint – halfway between the end points

• 5. ray – part of a line with one end point • 6. plane – flat unbounded surface • 7. intersecting lines – pass through the same point • 8. perpendicular lines – two lines that intersect a right angle • 9. vertex – point that two or more rays or lines have in common • 10. protractor – tool used to measure angles • 11. acute angle – angle whose measure is greater than 0 degrees and less than 90 degrees • 12. right angle – 90 degrees

13. Obtuse angle – angle who measure is greater than 90 degrees and less than 180 degrees 14. Circumference – distance around a circle 15. Perimeter – sum of the lengths of the sides of a polygon 16. Equilateral triangle – triangle with three lines of symmetry 17. Decagon – ten sided figure 18. Octagon – eight sided polygon 19. Hemisphere – half a sphere

20. Trapezoid – quadrilateral with exactly one pair of parallel lines 21. Scalene triangle – triangle with no lines of symmetry 22. Pentagon – five sided polygon 23. Congruent angles – two angles having the same measure 24. Isosceles triangle – triangle with exactly one line of symmetry 25. Right triangle – triangle that has one right angle