 Transversal, 2 Lines Intersected By A

2 lines that are intersected by a third line known as a transversal. Intersecting Lines, 2 Perpendicular

2 intersecting lines, one of which is vertical and one of which is horizontal. The intersection forms… Intersecting Lines, 3

3 lines which intersect at a common point. Intersecting Lines, 4

4 lines which intersect at a common point. Intersecting Lines, 4

4 lines which intersect at a common point. Transversal, 4 Parallel Lines Cut By A

4 parallel lines cut by a 5th line known as the transversal. Intersecting Lines, 8

8 lines which intersect at a common point. Dihedral Angle

A dihedral angle is the opening between two intersecting planes. Finding the Center of Mass

"Let any irregularly shpaed body, as a stone or chair, be suspended so as to move freely. Drop a plumb… Circle Polar Point

Intersection of lines between a circle and its polar point. Combination Horizontal Alignment/Intersection, Black and White

"The horizontal alignment Turn signs may be used in advance of situations where the horizontal roadway… Combination Horizontal Alignment/Intersection, Color

"The horizontal alignment Turn signs may be used in advance of situations where the horizontal roadway… Combination Horizontal Alignment/Intersection, Outline

"The horizontal alignment Turn signs may be used in advance of situations where the horizontal roadway… Combination Horizontal Alignment/Intersection, Silhouette

"The horizontal alignment Turn signs may be used in advance of situations where the horizontal roadway… Intersection of a Cone and a Plane

Illustration of the intersection of a cone and a plane. Conic Involution

The lines which join corresponding points in an involution on a conic all pass through a fixed point;… Plane Intersecting A Cylinder

Illustration of a cylinder cut by a plane making an angle of 57° with the base. Plane Bisecting Dihedral Angle

Diagram used to prove the theorem: "Every point in a plane which bisects a dihedral angle is equidistant… Ellipse Third Method

Draftsman's third method for drawing an ellipse Intersection of Hexagonal Pyramid and a Plane

Illustration of the intersection of a hexagonal pyramid and a plane. Hyperbola First Method

Draftsman's first method to draw a parabola Cone Intersected by a Plane to Form a Hyperbola

Diagram depicting a cone with both nappes intersected by plane J to form a hyperbola. Pantograph

An instrument for making a reduced, enlarged, or exact copy of a plane figure Parabola Foci Properties

The segments between the point of intersection of two tangents to a conic and their points of contact… 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… Perpendicular Planes

Two planes lie perpendicular to one another. A line perpendicular to plane 1 and a line perpendicular… 2 Intersecting Planes Perpendicular To A Third Plane

"If two intersecting planes are each perpendicular to a third plane, their intersection is also perpendicular… 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 Passed Perpendicular To A Given Plane

"Through a given line oblique to a plane, one, and only one plane, can be passed perpendicular to the… Pyramid Cut By Plane

Diagram used to prove the theorem: "If a pyramid is cut by a plane parallel to the base, the edges are… Sphere Cut By Plane

Diagram used to prove the theorem: "Every section of a sphere by a lane is a circle." 3 Intersecting Planes

Illustration of three intersecting planes. "The intersections of two parallel planes by a third plane… 3 Intersecting Planes

Illustration of three intersecting planes. "The straight line perpendicular to one of two parallel lanes… 3 Parallel Planes

"If two straight lines are cut by three parallel planes, the corresponding segments are proportional." Angles In Parallel Planes

"If two angles not in the same plane have their sides respectively parallel and lying in the same direction,… 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… Intersecting Planes

Illustration of two intersecting planes. 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. Parallel Planes

"If two intersecting lines are each parallel to a given plane, the plane of these lines is parallel… Perpendicular Planes

"If two planes are perpendicular to each other, a line in one of them perpendicular to the intersection…