Plane Geometry

 

Plane geometry is a two dimensional figure, also called planar geometry, with edges.  The edges are line segments or sides and curve segments or arcs, all lying on a flat plane.

plane Geometry Types

  • Plane Geometry (a shape like lines, circles and triangles)
    • Circle - A two-dimensional figure where all points are at a fixed equal distance from a center point.  See [ 1 ]
      • Circle Sector - A part of the interior of a circle having two radius boundries and an arc.
      • Half circle - Half of the interior of a circle having a straight chord and an arc.  See [ 1 ]
      • Hollow circle - Two circles each having all points on each circle at a fixed equal distance from a center point.  See [ 1 ]
      • Quarter circle - A part of the interior of a circle having two radius boundries at a 90° angle and an arc.  See [ 1 ]
      • Thin wall circle - Two circles each having all points on each circle at a fixed equal distance from a center point.  See [ 1 ]
    • Ellipse - A two-dimensional figure with a conic section or a stretched circle.
    • Polygon - A two-dimensional figure that is a closed plane figure for which all edges are line segments and not necessarly congruent.
      • Concave polygon - A two-dimensional figure that is a polygon where one or more angles are greater than 180° and some vertices point inward.
      • Convex polygon - A two-dimensional figure that is a polygon where all interior angles are less than 180° and all vertices point outward.
      • Irregular polygon - A two-dimensional figure that is a polygon where all edge and angles are not the same.  It can be concave or convex.
      • Regular polygon - A two-dimensional figure that is a polygon where all edges are congruent and all angles are congruent.
      • Self-intersecting polygon - A two-dimensional figure that is a polygon where one or more edges cross over another.
        • Triangle - A two-dimensional figure that is a polygon with three edges.
          • Right Isosceles Triangle - A two-dimensional figure that has one edge a right 90° interior angle and the other two angles are 45°.
          • Right Triangle - A two-dimensional figure that has one side a right 90° interior angle.
          • Equilateral Triangle - A two-dimensional figure that has three edges that are the same length and all sides and angles are congruent.
          • Isosceles Triangle - A two-dimensional figure that has two edges that are the same length or at least two congruent sides.
          • Oblique Triangle - A two-dimensional figure that is tilted at an angle, not horizontal or vertical.
            • Acute Triangle - A two-dimensional figure that has all three angles less than 90°.
            • Obtuse Triangle - A two-dimensional figure that has one of the three angles more than 90°.
          • Scalene Triangle - A two-dimensional figure where all three edges are different lengths and all three angles are different angles.
        • Quadrilateral - A two-dimensional figure that is a polygon with four edge.
          • Kite - A two-dimensional figure that is a quadrilateral with two pairs of adjacent sides that are congruent.
          • Parallelogram - A two-dimensional figure that is a quadrilateral with two pairs of parallel opposite sides.
          • Rectangle - A two-dimensional figure that is a quadrilateral with two pair of parallel edges.  See [ 1 ]
            • Cross - Two rectangles that intersect perpendicular at a center point.  See [ 1 ]
            • Hollow rectangle - A two-dimensional figure that is a quadrilateral with two pair of parallel edges.  See [ 1 ]
            • Square angle - Two rectangles that intersect at a 90° angle at one end each.  See [ 1 ]
            • Square channel - Three rectangles that intersect at 90° angles at each end of one rectangle.  See [ 1 ]
            • Square I beam - Three rectangles, two that intersect at the center at 90° angles to the end of one rectangle.  See [ 1 ]
            • Thin wall rectangle - A two-dimensional figure that is a quadrilateral with two pair of parallel edges.  See [ 1 ]
            • Zed - Three rectangles, two that intersect at a 90° angle to the third one at end each at different directions.  See [ 1 ]
          • Rhombus - A two-dimensional figure that is a parallelogram with four congruent sides.
          • Trapezoid - A two-dimensional figure that is a quadrilateral that has a pair of parallel opposite sides.
            • Isosceles Trapezoid - A trapezoid with only one pair of parallel edges and having base angles that are the same.
          • Square - A two-dimensional figure that is a quadrilateral with four equal side lengths and 90° interior angles.  See [ 1 ]
        • Pentagon - A two-dimensional figure that is a polygon with five sides.
        • Regular Pentagon is a two-dimensional figure that is a polygon with five congruent sides.
        • Hexagon - A two-dimensional figure that is a polygon with six sides.
        • Regular Hexagon - A two-dimensional figure that is a polygon with six congruent sides.
        • Heptagon - A two-dimensional figure that is a polygon with seven sides.
        • Regular Heptagon - A two-dimensional figure that is a polygon with seven congruent sides.
        • Octagon - A two-dimensional figure that is a polygon with eight sides.
        • Nonagon - A two-dimensional figure that is a polygon with nine sides.
        • Decagon - A two-dimensional figure that is a polygon with ten sides.
        • Hendecagon - A two-dimensional figure that is a polygon with eleven sides.
        • Dodecagon - A two-dimensional figure that is a polygon with twelve sides.
        • Triskaidecagon - A two-dimensional figure that is a polygon with thirteen sides.
        • Tetrakaidecagon - A two-dimensional figure that is a polygon with fourteen sides.
        • Pentadecagon - A two-dimensional figure that is a polygon with fifteen sides.
        • Hexakaidecagon - A two-dimensional figure that is a polygon with sixteen sides.
        • Heptadecagon - A two-dimensional figure that is a polygon with seventeen sides.
        • Octakaidecagon - A two-dimensional figure that is a polygon with eighteen sides.
        • Enneadecagon - A two-dimensional figure that is a polygon with nineteen sides.
        • Icosagon - A two-dimensional figure that is a polygon with twenty sides.
         
Display #
Title
Annulus
Arc Length of a Circle
Circle
Circle Sector
Circle Segment
Cross
Diameter of a Circle
Ellipse
Equilateral Triangle
Foci of an Ellipse