 ### Angle

Illustration that can be used to show the definition of an angle - an opening between two lines that… Axes showing trigonometric angles, and quadrants. ### Plane Angle of Incidence

A diagram illustrating the airplane's angle of incidence at axis A, direction of motion and thrust. ### Plane Pointing Down Angle of Incidence

The diagram illustrating the plane's angle of incidence pointing down at the motion axis. The plan will… ### Construction Of Angle On Straight Line

Illustration used to show how to "draw a straight line through any given point on a given straight line… ### -229 Degree Trigonometric Angle

Trigonometric angle -229 degrees. ### 467 Degree Trigonometric Angle

Trigonometric angle 467 degrees. ### Acute Angle

An illustration showing an angle the is less than a right angle. This is an acute angle. ### Bisected Angle

Illustration to show that if an angle is bisected, and if a line drawn through the vertex perpendicular… ### Bisected Angles

Illustration to show that the bisectors of two supplementary adjacent angles are perpendicular to each… ### Bisected Angle

Illustration to show that the bisector of one of two vertical angles bisects the other. ### Bisected Angles

Illustration to show that the bisector of two pairs of vertical angles formed by two intersecting lines… ### Dihedral Angle With Bisector

Illustration of a dihedral angle bisected by a plane. "Every point in a plane which bisects a dihedral… ### Bisected Vertical Angle of an Isosceles Triangle

Illustration to show that the bisector of the vertical angle of an isosceles triangle bisects the base,… ### Angle Bisector Drawn Parallel to A Side

Illustration to show that if through any point in the bisector of an angle a line is drawn parallel… ### Convex Polyhedral Angle

Illustration of a convex polyhedral angle. "The sum of the face angles of any convex polyhedral angle… ### Dihedral Angle

Illustration of dihedral angle AB (or M-AB-N) formed by planes. ### Dihedral Angle

Illustration of dihedral angle AB formed by planes. ### Dihedral Angle

A dihedral angle is the opening between two intersecting planes. ### Face Angles of Convex Polyhedral Angle

Diagram used to prove the theorem: "The sum of the face angles of any convex polyhedral angle is less… ### Golden Angle

Illustration showing the golden angle. The golden angle is the smaller of two angles created by dividing… ### Negative Trigonometric Angle

Negative trigonometric angle with initial and terminal sides labeled. ### Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point in its bisector… ### Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point not in its… ### Polyhedral Angle

Illustration of polyhedral angle. "The opening of three or more planes which meet at a common point… ### Positive Trigonometric Angle

Positive trigonometric angle with initial and terminal sides labeled. ### Right Angle

Right angle with square at perpendicular lines ### Straight Angle

An illustration showing a straight angle. When the sides of an angle extend in opposite directions,… ### Angles

Four types of angles: right, obtuse, acute, and straight. ### Angles

Showing different types of angles: right, acute, and obtuse. ### Acute, Obtuse, Straight, Right, And Reflex Angles

An illustration showing acute, obtuse, straight, right, and reflex angles. An illustration of two angles that are adjacent. They have the same vertex and a common side between…  ### Complementary Angles

Illustration of complementary angles. Two angles whose sum is a right angle. ### Two Equal Dihedral Angles

Illustration of 2 equal dihedral angles. ### Equal Dihedral Angles

Illustration of 3 equal dihedral angles. "Two dihedral angles have the same ratio as their plane angles." ### Equal trihedral angles

Illustration used to show that two trihedral angles are equal or symmetrical when the three face angles… ### Obtuse And Reflex Angles

An illustration showing an angle the is greater than a right angle and less than a straight angle. This… ### Right Angles With Same Vertex

An illustration showing when one straight line meets another straight line and makes the adjacent angles… ### Angles With Same Vertex

An illustration of angles with the same vertex made up of 4 lines. ### Angles Used to Illustrate Sum and Difference of Two Angles

Angles used to illustrate the sum and difference of two angles and trig identities. ### Superposition of Angles

Illustration of the superposition of two angles to compare magnitudes of the same kind. ### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle. ### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow… ### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow… ### Supplementary Angles

Illustration that can be used to show supplementary angles. The angles form a straight line. ### Symmetrical or Equal Trihedral Angles

Diagram used to prove the theorem: "Two trihedral angles, which have three face angles of the one equal… ### Reference Angles/Triangles Formed by Angles in Quadrants

Lines drawn to horizontal to form triangle ratios (reference triangles, angles). ### Reference Angles/Triangles Formed by Angles in Quadrants With Labels

Lines drawn to horizontal to form triangle ratios (reference triangles, angles). Axes, quadrants, abscissa,… ### Vertical Angles

Vertical angles are when two angles have the same vertex, and the sides of the one are prolongations… ### Angles With Parallel Sides

Illustration of two angles whose sides are parallel, each to each, to show they are either equal or… ### Positive and Negative Arcs in Circles

Illustration showing arcs measured in positive and negative angles. ### Oblique Axes

Angles on a modified coordinate plane. ### Angle Bisector

Illustration showing that the bisector of a given angle is the locus of points equidistant from the… ### Perpendicular Bisector of a Line

Illustration showing that the perpendicular bisector of a given line is the locus of points equidistant… ### Gas Chandelier

This gas chandelier is made out of metal and has a bold style with curves and angles.