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Math 301
Congruent
Vocabulary Review (from M 351)
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Shapes that are identical (same shape, same size)
Angles or line segments with the same measure.
Point
An undefined entity in geometry that indicates position, but has no dimension
Line
A set of points that form a straight path extending infinitely in 2 directions
Plane
A flat surface extending infinitely in all directions
Ray
Angle
A half-line. A part of a line with an endpoint, extending infinitely in one
direction.
A part of a line. A line segment has 2 endpoints and contains the points
between the endpoints.
An angle is formed by two rays with a common endpoint, called a VERTEX.
Acute angle
An angle with a measure < 90 degrees.
Right angle
An angle with a measure = 90 degrees
Obtuse angle
An angle with a measure between 90 and 180 degrees.
Straight angle
An angle with a measure of 180 degrees.
Parallel lines
Two lines in the same plane that do not intersect.
Perpendicular lines
Two lines that intersect to form right angles.
Concurrent lines
Three or more lines that intersect in one common points
Skew lines
Two lines that are not parallel but do not intersect
Figure
A two-dimensional shape with straight sides, contained in a plane
Solid
A three-dimensional shape
Simple figure
A figure whose sides have only their vertices in common.
Closed figure
A figure with no open end points
Polygon
A simple, closed figure
Triangle
A 3-sided polygon
Quadrilateral
A 4-sided polygon
Pentagon
A 5-sided polygon
Line Segment
Hexagon
A 6-sided polygon
Heptagon
A 7-sided polygon
Octagon
An 8-sided polygon
Nonagon
A 9-sided polygon
Decagon
A 10-sided polygon
Dodecagon
A 12-sided polygon
Acute triangle
All three angles measure less than 90 degrees
Right triangle
One angle measures 90 degrees
Obtuse triangle
One angle measures more than 90 degrees
Scalene triangle
No sides are congruent.
Isosceles triangle
Exactly two sides are congruent
Equilateral triangle
All sides are congruent
Similar polygons
Chord
Two polygons whose angles are congruent and whose corresponding sides
are in proportion (have the same ratio)
Set of point the same distance from a given point known as the center of the
circle. The measure of a circle is 360o.
A line segment connecting two points on a circle
Diameter
A chord that passes through the center of the circle
Radius
A line segment connecting the center of the circle to a point on the circle
Minor arc
A portion of the circle measuring less than 180o
Semicircle
An arc measuring 1800
Major arc
An arc measuring between 180o and 360o
Central angle
An angle whose vertex is the center of the circle and whose sides are radii of
the circle
An angle whose vertex is on the circle and whose sides are chords of the
circle
Circle
Inscribed angle