- Elementary shapes
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- Triangles
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- Triangle geometry
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- Objects defined for a triangle

- Euclidean plane geometry
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- Triangle geometry
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- Objects defined for a triangle

- Polygons by the number of sides
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- Triangles
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- Triangle geometry
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- Objects defined for a triangle

- Surfaces
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- Planar surfaces
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- Triangle geometry
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- Objects defined for a triangle

Pedal triangle

In geometry, a pedal triangle is obtained by projecting a point onto the sides of a triangle. More specifically, consider a triangle ABC, and a point P that is not one of the vertices A, B, C. Drop pe

Median triangle

The median triangle of a given (reference) triangle is a triangle, the sides of which are equal and parallel to the medians of its reference triangle. The area of the median triangle is of the area of

Medial triangle

The medial triangle or midpoint triangle of a triangle ABC is the triangle with vertices at the midpoints of the triangle's sides AB, AC and BC. It is the n=3 case of the midpoint polygon of a polygon

Tangential triangle

In geometry, the tangential triangle of a reference triangle (other than a right triangle) is the triangle whose sides are on the tangent lines to the reference triangle's circumcircle at the referenc

Fuhrmann triangle

The Fuhrmann triangle, named after Wilhelm Fuhrmann (1833–1904), is special triangle based on a given arbitrary triangle. For a given triangle and its circumcircle the midpoints of the arcs over trian

One-seventh area triangle

In plane geometry, a triangle ABC contains a triangle having one-seventh of the area of ABC, which is formed as follows: the sides of this triangle lie on cevians p, q, r where p connects A to a point

Extouch triangle

In geometry, the extouch triangle of a triangle is formed by joining the points at which the three excircles touch the triangle.

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