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# Chapter 9 Geometry vocabulary

AB
planea flat surface that extends indefinitely in all directions and has no thickness
intersecting linesThese lines lie in the same plan and have exactly one point in common
parallel linesThese lines lie in the same plan and never intersect
skew linesLines that lie in different planes. They aren't parallel nor intersecting.
pointA location - no size - named by a capital letter
linea series of points that extend in opposite directions without end.
rayA part of a line with one endpoint and all the points of the line on one side of the endpoint
segmentA part of a line with two endpoints and all points in between
acute anglean angle with the measure between 0 - 90 degrees
right anglean angle with the measure of 90 degrees
obtuse anglean angle that measures between 90 - 180 degrees
straight angle180 degrees ( a straight line)
complementary anglesangles that together measure 90 degrees
supplementary angleangles that together measure 180 degrees
adjacent anglesangles that share a vertex and a side but have no interior points in common
vertical anglesformed by 2 intersecting lines and are opposite each other
congruent anglesangles with equal measures
isosceles triangletriangle that has at least 2 congruent sides
equilateral triangletriangle that has 3 congruent sides
scalene triangletriangle that has NO congruent sides
angle sum of a triangle180 degrees
circlethe set of points in a plane that are all the same distance from a given point, called the center
radiusa segment that connects the center of a circle to the circle
diametera segment that passes through the center of a circle and has both endpoints on the circle
central anglean angle with its vertex at the center of a circle
chorda segment that has both endpoints on the circle
arcpart of a circle
semicirclehalf of a circle
transversala line that intersects two other lines at different points
rhombusfour congruent sides
squarefour right angles and four congruent sides
parallelogramboth pairs of opposite sides are parallel
trapezoidexactly one pair of parallel sides
rectanglefour right angles
perpendicular lineslines that intersect to form right angles
corresponding anlesangles that lie on the same side of the transversal and in corresponding positions
alternate interior anglesangles that are in the interior of a pair of lines and on opposite sides of the transversal
polygona closed plane figure with at least three sides, the sides meet only at their endpoints
congruent figurefigures that have the same size and shape, and their corresponding parts have equal measures
sigment bisectora line, segment or ray that divides a segment into 2 congruent segments
perpendicular bisectora line, segment or ray that is perpendicular to the segment that it bisects
angle bisectora ray that divides an angle into 2 congruent angles
rotationa transformation that turns a figure about a fixed point called the center of rotation
rotational symmetrya figure has rotational symmetry if you can rotate it 180 degrees, or less so that tis image matches the orginal figure

 Mrs. Englert Strategies Teacher Holy Innocents' Episcopal School