A diagram illustrating the airplane's angle of incidence at axis A, direction of motion and thrust.

The diagram illustrating the plane's angle of incidence pointing down at the motion axis. The plan will…

"The angle under which the rays of light, coming from the extremities of an object, cross each other…

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

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

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

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

Illustration to show that the bisector of two pairs of vertical angles formed by two intersecting lines…

Illustration to show that the bisector of the vertical angle of an isosceles triangle bisects the base,…

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

An illustration showing the construction used to divide an angle into two equal parts. "With C as a…

An illustration showing the construction used to divide an angle into two equal parts when the lines…

Illustration used to show "The two perpendiculars to the sides of an angle from any point in its bisector…

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

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

Trihedral angle. "The sum of any two face angles of a trihedral angle is greater than the third face…

Illustration showing two positive angles; angle 1 being the acute angle and angle 2 being the reflex…

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…

Angles 1 and 2 are adjacent angles. Two angles with a common vertex and a common side between them are…

An illustration showing an angle the is greater than a right angle and less than a straight angle. This…

Illustration of angles with parallel sides going in the opposite direction.

Illustration of angles with parallel sides. "GH is parallel to and lies in the same direction as DE,…

Illustration showing four angles that can be used to define different relationships, such as adjacent,…

Illustration showing four angles that can be used to define different relationships, such as adjacent,…

Illustration showing six angles that can be used to define different relationships, such as adjacent,…

Illustration of two triangles, showing the sine of the sum of two acute angles expressed in terms of…

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

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

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

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

Illustration that can be used to show supplementary angles. The angles form a straight line.

Illustration showing angles 1 and 2 are supplementary and angles ACD and DCB are supplementary. Also,…

Vertical angles are when two angles have the same vertex, and the sides of the one are prolongations…

Illustration of two angles whose sides are parallel, each to each, to show they are either equal or…

A fleet of three ancient Anglo-Saxon ships, each with wind filling the lone sail. Each ship has a dragon…

Illustration showing arcs measured in positive and negative angles.

Bevel, is a and tool consisting of two rules that are hinged together so you can draw or measure angles…

Illustration showing that the bisector of a given angle is the locus of points equidistant from the…

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

Illustration of one possible outcome (no triangle occurs) when discussing the ambiguous case using the…

Illustration of one possible outcome (1 triangle occurs) when discussing the ambiguous case using the…

Illustration of one possible outcome (2 triangles occur) when discussing the ambiguous case using the…

Circle with 36 degree angles marked. This diagram can be used with the following trig problem: Locate…

Circle modeling the earth. O is the center of the earth, r the radius of the earth, and h the height…

Illustration of a circle showing an angle included by a tangent and a chord drawn from the point of…

Circle with chord AB=2 ft. and radius OA = 3 ft.. Triangle AOC is a right triangle. Angle AOC=half angle…

Illustrations of a circle with segment, semicircle, sector, quadrant, and central angles drawn.

Illustration of a circle with two intersecting chords within the circumference. The angle formed is…

Illustration of a circle which illustrates that the tangents to a circle drawn from an external point…