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Mrs. Brown

point It is represented by a dot and named by a capital letter. It represents position.
line a connected set of infinitely many points and extends infinitely in two opposite directions
plane an infinite set of points forming a connected flat surface and extends infinitely in all directions
postulate a statement that is assumed true without proof
theorem a statement that can be proven
line segment a connected piece of a line with two endpoints and is named by its endpoints
midpoint a line segment that is the half way point from the endpoints
ray a piece of a line with only one endpoint and continues forever in one direction
angle two rays with the same endpoint
degrees an angle is measured by
angle bisector a ray that divides an angle into two equal angles
right angle an angle that measures 90 degrees
acute angle an angle that measures less than 90 degrees
obtuse angle an angle that measures greater than 90 degrees
straight angle an angle that measures 180 degrees
adjacent angle two angles that share a common side and share a common vertex
vertical angle formed when two lines intersect and form four angles...these angles are not adjacent angles
complementary angles two angles whose sum is 90 degrees
supplementary angles two angles whose sum is 180 degrees
intersecting lines two or more lines that meet at a point
perpendicular lines two lines that intersect and form right angles
parallel lines two lines, both in the same plane,that never intersect, and remain the same distance apart at all times
parallel planes two planes that do not intersect
equiangular triangle a triangle having all angles of equal measure
equilateral triangle a triangle with all three sides equal in measure
isosceles triangle a triangle in which at least two sides have equal measure
scalene triangle a triangle with all three sides of different measure
altitude of an angle angle height
triangle three-sided polygon
quadrilateral four-sided polygon
pentagon five-sided polygon
hexagon six-sided polygon
heptagon seven-sided polygon
octagon eight-sided polygon
nonagon nine-sided polygon
decagon ten-sided polygon
perimeter the total distance around an object or a shape
Created by: ng