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line segments, where each line segment intersects exactly two others.

A vertex is the point where two sides of
a polygon meet.

Triangle  A threesided polygon.  Equilateral Triangle  A triangle having
all three sides of equal length.

Isosceles Triangle  A triangle having
two sides of equal length.

Scalene Triangle  A triangle having three
sides of different lengths.

Acute Triangle  An acute triangle is a
triangle with all three angles less than 90°.

Obtuse Triangle  An obtuse triangle is
a triangle with one angle more than 90°.

Right Triangle  A triangle having a right
angle. One of the angles of the triangle measures 90 degrees.

Quadrilateral  A foursided polygon.

Rectangle  A foursided polygon having
all right angles.

Square  A foursided polygon having equallength
sides meeting at right angles.

Parallelogram  A foursided polygon with
two pairs of parallel sides.

Rhombus  A foursided polygon having all
four sides of equal length.

Trapezoid  A foursided polygon having
exactly one pair of parallel sides.

Hexagon  A sixsided polygon.

Pentagon  A fivesided polygon.

Heptagon  A sevensided polygon.

Octagon  An eightsided polygon.

Nonagon  A ninesided polygon.

Decagon  A tensided polygon.

Parallel lines are two lines in the same
plane that never intersect.

A plane is a flat, twodimensional object.  A point specifies only location; it has no length, width, or depth. 
The radius of a circle is the distance from the circle's center to a point on the circle, and is constant for a given circle.  A circle is the set of all points in a
plane that are equidistant from a given point in the plane.

A circle's diameter is a segment that passes through the center and has its endpoints on the circle.  A ray can be thought of as a half a line. It has a point on one end, and it extends infinitely in the other direction. 
Congruent triangles are triangles that
have the same size and shape.

A line has only one dimension: length.
It continues forever in two directions (so it has infinite length), but
it has no width at all.

A line segment is the portion of a line lying strictly between two points. It has a finite length and no width.  Solid Figures have length, width, and height.

A sphere is a figure with all points the
same distance frome the center.
A cube is a threedimensional shape with six square or rectangular sides. A cylinder has two prallel faces that are circles. The circles are called bases. The distance from the center of the circle to a point on the circle is called the radius. A rectangular prism is a solid figure where all sides are rectangles and all sides meet perpendicular. A cone is a figure created by connecting every point of a circle to a point not in the plane of the circle. The point is called the vertex and the circle is called the base. A pyramid is a figure created by connecting
every point of a polygon to a point not in the plane of the polygon.


A sphere has 0 Faces 0 Lat Faces 0 Bases 0 Vertices 0 Lat Edges 0 Base Edges  A cube has 6 Faces 4 Lat Faces 2 Bases 8 Vertices 4 Lat Edges 8 Base Edges 
A cylinder has 2 Faces 0 Lat Faces 2 Bases 0 Vertices 0 Lat Edges 0 Base Edges  A cone has 1 Faces 0 Lat Faces 1 Bases 1 Vertices 0 Lat Edges 0 Base Edges 
A rectangular prism has 6 Faces 4 Lat Faces 2 Bases 8 Vertices 4 Lat Edges 8 Base Edges  A pyramid has 5 Faces 4 Lat Faces 1 Bases 5 Vertices 4 Lat Edges 4 Base Edges 