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# ICC Math 201 Ch10

### ICC Math 201 Geometry Terms

acute angle an angle with a measure between 0 and 90 degrees
acute triangle a triangle with three acute angles
adjacent angles two angles that have the same vertex and a common side, but no common interior points
altitude of a triangle a segment from a vertex of a triangle that is perpendicular to a line containing the opposite side of the triangle
angle bisector the ray in the interior of an angle that divides the angle into two congruent angles
angle the figure formed by two rays with a common endpoint
bisector of a segment any point, segment, ray, or line that cuts the segment in half.
center of a circle the point that is equidistant from every point on the circle
chord of a circle a segment whose endpoints are on the circle
circle the set of all points in a plane that are the same distance from a given point
closed curve a path in a plane that begins and ends at the same point
collinear points that lie on the same straight line
complementary angles two angles whose measures have a sum of 90 degrees
concave polygon a polygon in which one or more of the interior angles is greater than 180 degrees
concurrent lines three or more lines that intersect in one point
congruent segments segments that have the same length
coplanar points that lie on the same plane
decagon a polygon having ten sides
degree measure a number which describes the size of an angle
diameter of a circle a chord that goes through the center of the circle
dodecagon a polygon having twelve sides
equiangular triangle a triangle with three congruent angles
equilateral triangle a triangle with three congruent sides
exterior of an angle the set of all points not in the interior or on the angle
heptagon a polygon having seven sides
hexagon a polygon having six sides
interior angle of a polygon an angle formed by two sides of the polygon that have the same endpoint
interior of an angle the set of all points contained on and inside the two rays of an angle
isosceles triangle a triangle with at least two congruent sides
kite a quadrilateral having two pairs of adjacent sides that are congruent (no side is used twice in the pairs)
length measure a number assigned to a segment to describe its length
line a set of points in a straight, unlimited length, with no thickness or endpoints
linear pair of angles two adjacent angles whose noncommon sides are on the same line
median of a triangle a segment from the vertex of an interior angle to the midpoint of the opposite side
midpoint of a segment the point on a segment which divides the segment in half
n-gon a polygon with a whole number 'n' number of sides
nonagon a polygon having nine sides
nonsimple closed curve a closed curve that crosses itself at least once
nonsimple polygon a polygon with at least one pair of segments that intersect at a point that is not their endpoint
obtuse angle an angle with a measure between 90 and 180 degrees
obtuse triangle a triangle with one obtuse angle
octagon a polygon having eight sides
parallel lines two or more lines that are always the same distance apart
parallelogram a quadrilateral with opposite sides parallel and congruent
pentagon a polygon having five sides
perpendicular bisector a line perpendicular to a segment that divides the segment into two congruent segments
perpendicular lines two lines which intersect to form four right angles
plane a set of points in a flat surface that has no thickness and no edges
point of intersection the point where two or more lines cross each other
point a location that has no length, width or thickness
polygon a shape formed by three or more points joined by three or more straight lines.
protractor a device for measuring angles
quadrilateral a polygon having four sides
radius of a circle a segment whose endpoints are the center of the circle and a point on the circle
ray A part of a line extending in one direction from one endpoint though another point.
rectangle a quadrilateral in which opposite sides are congruent and parallel and all interior angles are right angles
reflex angle an angle that is greater than 180 degrees but less than 360 degrees
regular polygon a simple polygon with all sides congruent and all interior angles congruent
rhombus a quadrilateral having four congruent sides and opposite sides parallel
right angle an angle with a measure of 90 degrees
right triangle a triangle with one right angle
scalene triangle a triangle with no congruent sides
segment the part of a line between two endpoints
sides of the triangle the three line segments which meet each other only at their end points
simple closed curve a closed curve that does not cross itself
simple convex polygon a polygon where all interior angles are less than 180 degrees.
simple nonconvex polygon a concave polygon
simple polygon a polygon with all its segments touching only at their endpoints
skew lines Nonintersecting lines that do not lie in the same plane
space the set of all points that has no boundaries
square a quadrilateral having four congruent sides and four right angles
straight angle an angle that measures 180 degrees
supplementary angles two angles whose measures have a sum of 180 degrees
trapezoid a quadrilateral having only one pair of opposite sides parallel
triangle a polygon having three sides
vertex of an angle the common end point of the two rays that form the angle
vertices of a triangle the three endpoints of the sides of the triangle
vertical angles two angles that are formed by intersecting lines that are not a linear pair of angles
zero angle an angle with no rotation (actually a ray)
icosagon a polygon with twenty sides
Created by: mhohulin