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# ICC Math 201 Ch10

### ICC Math 201 Geometry Terms

Question | Answer |
---|---|

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