Geometry


 Angles
 Lines
 Plane Figures 1
 Plane Figures 2
 Points, Lines, and Segments
 Polygons
 Polygons 2
 
 Practice
 Triangles

 
Solids Online Quiz
Lines Online Quiz
Polygon Online Quiz
Polygon 2 Online Quiz
Polygon 3 Online Quiz



 
A polygon is a closed figure made by joining line segments, where each line segment intersects exactly two others.
A vertex is the point where two sides of a polygon meet.
Triangle - A three-sided 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 four-sided polygon.
Rectangle - A four-sided polygon having all right angles.
Square - A four-sided polygon having equal-length sides meeting at right angles.
Parallelogram - A four-sided polygon with two pairs of parallel sides.
Rhombus - A four-sided polygon having all four sides of equal length.
Trapezoid - A four-sided polygon having exactly one pair of parallel sides.
Hexagon - A six-sided polygon.
Pentagon - A five-sided polygon.
Heptagon - A seven-sided polygon.
Octagon - An eight-sided polygon.
Nonagon - A nine-sided polygon.
Decagon - A ten-sided polygon.
Parallel lines are two lines in the same plane that never intersect.

 

A plane is a flat, two-dimensional 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 three-dimensional 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