The Miscellaneous Triangles ClipArt gallery includes illustrations of isosceles, scalene, equilateral, obtuse, acute, concentric, and similar triangles. There are also images of real-world triangles that can be used in application problems, triangles with bisectors drawn, and triangles that are labeled to derive the area formula.

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

"The triangle ABC is divided into 2 right triangles I and II. ABC is seen to be equal to 1/2 of the…

"The child sees triangle ACB = triangle ADB, and that I + II = CA - DB; and so he sees that the area…

"Fig. 3 shows triangle I = triangle II, III = IV, and so triangle ABC = 1/2 of rectangle ABDE. The fact…

Illustration of an equilateral triangle that shows both the centroid (where the medians of the sides…

Illustration of 10 congruent equilateral triangles that have the same center. Each triangle has been…

Illustration of 20 congruent equilateral triangles that have the same center. Each triangle has been…

Illustration of 3 concentric equilateral triangles that are equally spaced.

Illustration of 4 concentric equilateral triangles that are equally spaced.

Illustration of 5 congruent equilateral triangles that have the same center. Each triangle has been…

Illustration of a ladder leaning against a palm tree, that is perpendicular to the ground, to form a…

Illustration that uses triangles to measure the distance across a lake.

Illustration that uses triangles to measure the distance across a lake.

Pentagon with dimensions labeled. Pentagon can be used to calculate area by calculating individual triangles…

Illustration that uses triangles to measure the distance across a river.

Illustration that uses triangles to measure the distance across a river.

Illustration that uses triangles to measure the distance across a river.

An illustration of a square and triangles within the square. This is an example of a problem that can…

Illustration of a giant stepladder, sometimes called a skyscraper stepladder, that is opened next to…

Triangle with sides labeled with numerals 28, 36, 40 and angles A, B, C labeled.

An illustration of a triangle comprised of a church and two lines. This illustration can be used to…

An illustration of a three triangles created with boats and a lighthouse. This is an example illustration…

An illustration of a triangle comprised of a tower and two lines. This illustration can be used to determine…

An illustration of a triangle comprised of a tree and two lines. This is an example of a problem that…

Illustration showing an acute triangle (one that has all three angles that are acute).

Illustration showing a triangle with an altitude CD passing through the middle of EF. Triangles AEC…

Illustration to show altitudes drawn from base angles of an isosceles triangle.

Parallelogram illustration to show where the area of a triangle formula comes from.

Illustration of triangle ABC with altitude a and base b to be used to demonstrate that the area is 1/2ba.

Illustration to show the bisector of the vertical angle of a triangle makes with the perpendicular from…

Illustration to show that the bisector of an exterior angle of an isosceles triangle, formed by producing…

Illustration of a triangle showing that when a line parallel to the base of a triangle bisects one side,…

Illustration to show if the bisector of the base angles of a triangle are drawn, and through their point…

Illustration to show the bisector of the vertical angle A of a triangle ABC, and the bisectors of the…

Illustration to show perpendicular bisectors in a triangle. It is known as the circumcenter.

Triangle construction when given two angles and the included side.

Illustration showing an equiangular triangle (one that has all three angles that are equal).

An illustration showing a triangle with interior angles A, B, C, and exterior angles D, and A' + B'.

Illustration showing a triangle with exterior angles. This can be used to show the sum of the three…