Plane Geometry

Plane geometry is the portion of geometry dealing with figures in a plane, as opposed to solid geometry.

Plane geometry is a high school-level concept that would be first encountered in a geometry course covering plane geometry.

Classroom Articles on Plane Geometry

	Acute Angle	Hypotenuse
	Altitude	Midpoint
	Angle	Obtuse Angle
	Area	Parallel
	Circle	Perimeter
	Circumference	Perpendicular
	Collinear	Pi
	Complementary Angles	Point
	Diameter	Radius
	Geometric Construction	Supplementary Angles
	Golden Ratio	Triangle Inequality
	Golden Rectangle

Classroom Articles on Geometry (Up to High School Level)

	Cone	Octahedron
	Congruent	Parallelogram
	Convex Hull	Pentagon
	Cross Section	Platonic Solid
	Cube	Polygon
	Cylinder	Polyhedron
	Decagon	Polytope
	Dodecagon	Prism
	Dodecahedron	Pyramid
	Equilateral Triangle	Quadrilateral
	Geometry	Rectangle
	Hendecagon	Regular Polygon
	Heptagon	Right Triangle
	Hexagon	Similar
	High-Dimensional Solid	Solid Geometry
	Hypercube	Sphere
	Hyperplane	Square
	Hypersphere	Surface
	Icosahedron	Surface Area
	Isosceles Triangle	Tetrahedron
	Linear Function	Trapezoid
	Nonagon	Triangle
	Octagon	Volume