Nonagon Inscribed in a Triangle
Illustration of a regular nonagon inscribed in an equilateral triangle. This could also be described…
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.
Orthocenter of Triangle
Illustration to show altitudes in a triangle. It is known as the orthocenter.
Triangle With Parallel Segment Drawn
Illustration of a triangle with a segment parallel to the base.
Isosceles Triangle With Parallelogram inside
Illustration to show that if from any point in the base of an isosceles triangle parallels to the legs…
Parts Of A Triangle
Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors,…
Triangle With Perpendicular Bisector
Illustration showing a perpendicular bisector of a triangle extended outside of the triangle.
Perpendiculars Dropped From Midpoint of Base to Legs of Isosceles Triangles
Illustration to show the perpendiculars dropped from the midpoint of the base to the legs of an isosceles…
Point in Base of Isosceles Triangle
Illustration to show that the difference of the distances from any point in the base produced of an…
Pythagorean Theorem Triangle
Right triangle with squares that can be used to illustrate the Pythagorean Theorem.
Right Triangle With Midpoint of Hypotenuse Drawn
Illustration of a right triangle with the midpoint of the hypotenuse drawn.
Right Triangle With One Angle Double the Other
Illustration of a right triangle with one angle the double of the other.
Rondinella Triangle
The Rondinella triangle is a modified triangle ruler, where the hypotenuse is outwardly bent.
Triangle With Segment Extended for Exterior Angle
Illustration showing a triangle with an exterior segment drawn to show and exterior angle. This can…
Segments and Angles in a Triangle
Illustration of a triangle with interior segments and angles labeled.
Segments and Angles in a Triangle
Illustration of a triangle with interior segments and angles labeled.
Segments Labeled In A Triangle
Illustration of triangle ABC with BE extended through the triangle at point D. Segment AB is equal to…
Zange Triangle
The Zange triangle is a modified triangle ruler, where one of the legs is longer making the hypotenuse…
3 Isosceles Triangles Wit Equal Bases
Illustration of three isosceles triangles with the same base AC but varying heights (as B gets farther…
Circle Made Up Of Triangles
"A circle may be considered as made up of triangles whose bases form the circumference, and whose altitude…
Equal Triangles
Illustration used to show that two triangles are equal if the three sides of one are equal respectively…
Equal Triangles by Side Side Side
Illustration showing two equal triangles. This can be used to show that two triangles are equal if the…
Proof of Equal Triangles Drawing
Illustration to show if two triangles have two sides of the one equal, respectively, to two sides of…
Equilateral And Isosceles Triangles
An illustration showing an isosceles triangle in an equilateral triangle.
Equilateral Triangle Inscribed In An Equilateral Triangle
Illustration of an equilateral triangle inscribed in an equilateral triangle. The smaller triangle is…
Equilateral Triangles Inscribed In An Equilateral Triangle
Illustration of an equilateral triangle inscribed in an equilateral triangle by joining the midpoints…
Equilateral Triangles Inscribed In Equilateral Triangles
Illustration of an equilateral triangle inscribed in an equilateral triangle by joining the midpoints…
Equilateral Triangles Inscribed In Equilateral Triangles
Illustration of an equilateral triangle inscribed in an equilateral triangle by joining the midpoints…
Kelsey Triangles
The Kelsey triangle is a modified triangle ruler, where the hypotenuse is inwardly bent.
Equal Right Triangles by Hypotenuse Leg
Illustration showing two equal right triangles. This can be used to show that two right triangles are…
Triangles With The Same Base
Illustration to show two triangles with the same base and on the same side of the base.
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
Illustration of a triangle divided by a parallel line to form two similar triangles.
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.
