Leg Of A Right Triangle

Length

Line

Line Segment

Lune

Major Arc

Major Circular Sector

Major Circular Segment

Measure of a Circle

Measure of a Line Segment

Measure of a Surface Area

Measure of an Angle

Medial Quadrilateral

Medial Triangle

Median

Minor Arc

Minor Circular Sector

Minor Circular Segment

Net of a Cone and a Cylinder

Nonagon

Obtuse Triangle

Octagon

Orthocentre

Orthogonal

Parallel

Parallel Curves

Parallel Line Segments

Parallelogram

Pencil of Circles

Pencil of Lines

Pentadecagon

Pentagon

Pentomino

Perimeter

Periodic Tessellation

Perpendicular

Perpendicular Bisector

Perpendicular Line Segments

Perpendicular Lines

Pick’s Theorem

Pierre Herigone (1580-1644)

Plane

Plane Geometric Figure

Plane Quadrilateral

Plane Surface

Polygon

Polygon Circumscribed About a Circle

Polygon Inscribed in a Circle

Polygonal Chain

Polyiamond

Polyomino

Pythagoras (c. 580 – c. 495 BCE)

Pythagorean Equation

Pythagorean Triple

Quadrilateral

Ray

Re-Entrant Angular Sector

Rectangle

Reduction

Reflection in a Cartesian Plane

Reflex Angle

Region In the Plane

Regular Polygon

Regular Star Polygon

Regular Tessellation

Relationship of Congruence

Relationship of Symmetry

Remote Interior Angle

Rhomb

Rhombus

Right Trapezoid

Right Triangle

Rotation in a Cartesian Plane

Rotational Symmetry

Sagitta

Salient Angular Sector

Scalene

Scalene Polygon

Scalene Triangle

Sector

Segment of a Curve

Self-Intersecting or Star Quadrilateral

Self-Intersecting Polygon

Semi-Regular Tessellation

Semicircle

Side

Side of a Polygon

Side of an Angle

Similar

Similar Figures

Similar Polygons

Similar Triangles

Similarity

Simple Curve

Sine of an Angle

Skew

Sliding

Solving Triangles

Square

Star Polygon