# Shared Flashcard Set

## Details

Geometry Flash Cards
N/A
52
Mathematics
02/15/2009

Term
 Point
Definition
 A point has no size, but marks itself in space. It is represented by a small dot, and it is labeled with a capital letter.
Term
 Line
Definition
 A line extends in opposite directions without end. It has no width, and it cannot be measured. It is represented by a straight line with an arrow on each end, and it is labeled using the names of two points on the line. It can also be labeled with one lowercase cursive letter.
Term
 Plane
Definition
 A flat surface that extends out in all directions. It is represented by a flattened rectangle shape. A place cannot be measured.It is labeled with 3 points that are not in a straight line.  A plane can also be labeled with a capital script letter written in a corner.
Term
 Space
Definition
 Space is the air around us. It is the place where everything exists. Space cannot be measured.  There is no specific notation for space.
Term
 Line Segment
Definition
 A line segment has length, but no width. It it considered to be part of a line between two  points. The distance between the two points is considered the legth of the line segment.A line is named with the two endpoints and a line over them. The lenght of the line is notated using just the two endpoints.
Term
 Ray
Definition
 A ray has no length and is sometimes thought of as half of a line. It has one endpoint and continues in one direction endlessly.A ray is named using the endpoint first and another point that the ray passes through.
Term
 Intersection
Definition
 The set of points two or more geometric figures have in common.If two figures have just one point in common, then that point is called the point of intersetion.
Term
 Parallel Lines
Definition
 Parallel lines lie the same distance between from each other. These lines never intersect.
Term
 Perpendicular Lines
Definition
 Perpendicular lines meet each other at a right angle.
Term
 Skew Lines
Definition
 Skew lines are lines that are not in the same place and never intersect.
Term
 Midpoint
Definition
 The midpoint of a segment is the point that is the same distance from each endpoint.
Term
 Bisect
Definition
 If a figure is bisected, then it is cut into two pieces that are equal in size.
Term
 Acute Angle
Definition
 An angle whose measure is between 0 and 90 degrees.
Term
 Right Angle
Definition
 An angle whose measure is exactly 90 degrees.
Term
 Obtuse Angle
Definition
 An angle whose measure is between 90 and 180 degrees.
Term
 Straight Angle
Definition
 An angle whose measure is exactly 180 degrees.
Term
Definition
 A pair of angles that share a vertex and a side. * The term adjacent means "side by side."
Term
 Complementary Angles
Definition
 Angles whose measures add up to 90 degrees. * These angles make a right angle.
Term
 Supplementary Angles
Definition
 Angles that add up to 180 degrees.
Term
 Linear Pair
Definition
 A Linear pair is created by two angles that are adjacent and supplementary.
Term
 Vertical Angles
Definition
 Vertical Angles are formed when two lines intersect. These angles are congruent; they are equal to each other.
Term
 Polygon
Definition
 A polygon is a simple closed figure. It is made up of line segments and never contains curved lines.
Term
 Convex Polygon
Definition
 A polygon where the line connecting any two points inside the polygon lies wholly inside the polygon.
Term
 Concave Polygon
Definition
 A polygon where the line connecting any two points inside the polygon will go outside of the polygon. * Concave polygon "caves in" at some point.
Term
 Polygons: Triangle; Quadrilateral; Pentagon; Hexagon; Heptagon; Octagon; Nonagon; Decagon or Decahedron; Dodecagon; n-gon.
Definition
 Triangle - 3 sidesQuadrilateral - 4 sidesPentagon - 5 sidesHexagon - 6 sidesHeptagon - 7 sidesOctagon - 8 sidesNonagon - 9 sidesDecagon or Decahedron - 10 sidesDodecagon - 12 sidesN-gon - "n" sides
Term
 Regular Polygon
Definition
 All of the sides have equal length and all of the interior angles have equal measure.
Term
 Vertex
Definition
 The vertices* of a polygon are the points on the corners where two line segments come togehter. * Plural form of "vertex"
Term
Definition
 The distance from the center of the polygon to the vertex.
Term
 Apothem
Definition
 The distance from the center of a regular polygon to the midpoint of the side of the polygon. * It must also be perpendicular to the side of the polygon.
Term
 Equilateral Triangle
Definition
 All three sides of the triangles are equal lengths.
Term
 Isosceles Triangle
Definition
 Two of the sides are equal in length.
Term
 Scalene Triangle
Definition
 None of the sides are the same length.
Term
 Equiangular Triangle
Definition
 All three angles are the same size.
Term
 Acute Triangle
Definition
 All three angles have measures less than 90 degrees.
Term
 Obtuse Triangle
Definition
 One angle measures greater than 90 degrees.
Term
 Right Triangle
Definition
 One angle measures 90 degrees.
Term
 Kite
Definition
Term
 Parallelogram
Definition
 A quadrilateral with 2 pair of parallel sides and 2 pair of congruent sides.
Term
 Trapezoid
Definition
 A quadrilateral with one pair of parallel side.
Term
 Rectangle
Definition
 A parallelogram with 4 right angles.
Term
 Rhombus
Definition
 A Parallelogram with 4 congruent sides.
Term
 Isosceles Trapezoid
Definition
 A trapezoid with congruent non-parallel sides.
Term
 Square
Definition
 A parallelogram that has congruent sides and four right angles.
Term
 Circle
Definition
 The set of points in a plane that are equidistant from one point.
Term
Definition
 The distance from the center of the circle to the edge of the circle.
Term
 Chord
Definition
 A segment from one edge of the circle to the other edge anywhere on the circle.
Term
 Central Angle
Definition
 A central angle is made using two radii (plural form of radius) of the circle. It is an angle with its vertex on the center of the circle.
Term
 Minor Arc
Definition
 Minor Arcs extend less than half way around the circle.
Term
 Major Arc
Definition
 Major Arcs extend more than half way around a circle.
Term
 Semicircle
Definition
 Semicircle extend exactly halfway around a circle. It measures 180 degrees.
Term
 Congruent Figures
Definition
 Congruent figures are figures that are the same size and shape.
Term
 Congruence Statement
Definition
 A congruence statement is a statement about different sides, angles, or figures that are congruent.  * Example: Triangle ABC is congruent or equal to Triangle DEF.
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