Angle Bisector of Triangle Dividing Opposite Side Into Proportionate Segments
Illustration to show that an angle bisector of a triangle divides the opposite side into segments which…
Exterior Angle Bisector of Triangle Dividing Opposite Side Into Proportionate Segments
Illustration to show that a bisector of a an exterior angle of a triangle divides the opposite side…
Parallel Lines Cut by Parallels, Corresponding Intercepts Proportional
Illustration to show that if parallel lines are cut by any number of parallels, the corresponding intercepts…
Triangle Divided by Parallel Lines to Form Proportionate Triangles
Illustration to show that if a line is drawn through two sides of a triangle parallel to the third side,…
Triangle Divided by Parallel Lines to Form Proportionate Triangles
Illustration to show that if a line divides two sides of a triangle proportionally, it is parallel to…
2 Right Pentagonal Pyramids
Illustration of 2 right pentagonal pyramids with hidden edges shown. The pentagonal bases are congruent,…
2 Right Rectangular Pyramids
Illustration of 2 right rectangular pyramids with hidden edges shown. The rectangular bases are congruent,…
Similar Pentagonal Pyramids
Illustration of 2 similar right pentagonal pyramids with hidden edges shown. The height of the pyramid…
Relation of Head to Height by Age
At birth the head measures about 4 times into height. At 5 years the head measures about 6 times into…
Construction of Proportional Square
Illustration used to construct a square that shall be in proportion to a given square.
Construction of Proportional Square
Illustration used to construct a square that shall be in proportion to a given square.
Two Proportional Tetrahedrons
Diagram used to prove the theorem: "Two tetrahedrons having a trihedral angle in each equal, are to…
Leaning Tower
Illustration of a leaning tower with a perpendicular drawn from the top of the tower to the ground to…
Palm Tree Perpendicular to Ground
Illustration of a palm tree that is perpendicular to the ground. The tree is perfectly straight, as…
Using Proportions To Find Heights of Trees
Triangle diagram for measuring heights of trees using proportions.
Using Proportions To Find Heights of Trees
Triangle diagram for measuring heights of trees using proportions
Right Triangle Inscribed in Semicircle Shows Mean Proportional
Right triangle inscribed in semicircle. Illustration shows that the perpendicular from any point in…
Oblique Triangle for Distance Across a River
Illustration of oblique triangle used to find distance across a river.
Oblique Triangle for Distance Across a River
Illustration of oblique triangle used to find distance across a river.
Oblique Triangle for Distance Across Lake
Illustration of oblique triangle used to find distance across a lake.
Mutually Equiangular Similar Triangles
Illustration that shows two mutually equiangular triangles are similar.
Similar Triangles With Respective Sides Parallel or Perpendicular
Illustration that shows that two triangles which have their sides respectively parallel, or respectively…
Similar Triangles for Distance Across Lake
Illustration of similar triangles used to find distance across a lake.
Similar Triangles for Distance Across Stream
Illustration of similar triangles used to find distance across a stream
Similar Triangles for Height of Smokestack
Illustration of similar triangles used to find height of smokestack.
Similar Triangles With Altitudes Drawn
Illustration that shows two similar triangles with altitudes drawn.
Visual Angle
"Suppose the object a, appears to the naked eye of the length repreesnted in the drawing. Now, as the…