Parallel Lines

"Two straight lines that are parallel to a third are parallel to each other."

Plane Intersecting Octagonal Prism

Illustration showing the intersection of a plane with an octagonal prism.

Cone Intersected by a Plane to Form a Parabola

Diagram of a cone intersected by plane J to form a parabola. Also pictured is a circle formed by the…

Construction of a Parabola

Diagram showing how to construct a parabola when given the directrix (d), the focus (F) and the eccentricity…

Front View Pusher Aeroplane Plan

A pusher aeroplane plan illustrating the proper ribbing and wiring for the plane. The wires are used…

Propeller Aeroplane Side Plan

A propeller airplane plan illustrating the proper location of the skeleton and placement of the wires…

Propeller Aeroplane Top Plan

A top view plan of a propeller aeroplane, or airplane. The plan shows the proper ribs and skeleton for…

Propeller Aeroplane Top Plan

A side view plan of a propeller aeroplane for two people. The plan illustrates the the proper location…

Pusher Aeroplane Plan

A plan for pusher aeroplane, or airplanes. The propeller of the pusher plane is located behind the cockpit…

Angle of Two Planes

To determine the angle between two planes.

Plane Determined by 2 Intersecting Lines

Illustration of a plane determined by 2 intersecting lines

Line Perpendicular To Plane

"If a straight line is perpendicular to each of two straight lines at their point of intersection it…

Line Projected Upon Plane

Illustration of a straight line projected upon a plane.

Lines Perpendicular To A Plane

"If one of two parallels is perpendicular to a plane, the other is also."

Locus Point to a Plane

"The locus of a point in space equidistant from the extremities of a straight line is the plane perpendicular…

Oblique Lines Drawn to a Plane

Oblique lines drawn from a point to a plane.

Plane Determined by 2 Parallel Lines

Illustration of a plane determined by 2 parallel lines

Line Perpendicular to Plane

If a straight line is perpendicular to each of two other straight lines in a plane at their point of…

Line Perpendicular to Plane

Straight line AB is perpendicular to the lines in plane MN at point B.

Line Perpendicular to Plane

Straight line AB is perpendicular to the lines in plane MN at point B. "If from the foot of a perpendicular…

Lines Perpendicular to Plane

Two straight lines, AB and CD, perpendicular to the same plane (MN) are parallel.

Plane Rotated About a Straight Line

Illustration of a plane rotated about a straight line.

Intersecting Planes

The intersection of two planes is a straight line.

Intersecting Planes

The intersection of two planes is a straight line.

Intersecting Planes

The intersection of two planes is a straight line.

Intersecting Planes

The intersection of two planes is a straight line.

Intersecting Planes

Two intersecting planes on a third plane. "If two intersecting planes are each perpendicular to a third…

Parallel Planes

Illustration of two parallel planes. "Two planes perpendicular to the same straight line are parallel."

Parallel Planes

Two parallel planes cut by a third plane.

Parallel Planes

Two parallel planes perpendicular to a line (AB). "A straight line perpendicular to one of two parallel…

Parallel Planes Cut By 2 Lines

Three parallel planes cut by two lines.

Prism

Illustration of a prism - a polyhedron of which two faces are equal polygons in parallel planes, and…

Intersection of a Prism and a Plane

Illustration of the intersection of a prism and a plane.

Intersection of Surface of Revolution and Plane

"A series of planes as S—S are passed perpendicular to the axis of revolution, cutting out the…

Airplane Rudder and Elevator

A propeller airplane with rudder, elevator, and ailerons. The rudder stabilizes the plane vertical,…

Sphere With Tangent Plane

Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…

Sphere With Tangent Plane

Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…

Intersection of Square Pyramid and a Plane

Illustration of the intersection of a square pyramid and a plane.

Intersection of Square Pyramid and a Plane

Illustration of the intersection of a square pyramid and a plane.

Inclined Plane Forming Right Triangle

Inclined plane forming right triangle showing the velocity of a body sliding a distance,s, down a smooth…

Intersection of Triangular Pyramid and a Plane

Illustration of the intersection of a triangular pyramid and a plane.