It can form 7 triangles
A square based pyramid has 4 triangular faces and 1 square face.
there are 27 triangles in a triangle
right triangles and
There are 15 triangles in a 17-agon
It can form 7 triangles
If it is in the form of two inverted triangles, then there are 8 triangles. If only the outline is used, there are 0 triangles.
One square and four triangles.
sphere
A geodesic domeis a spherical or partial-spherical shell structure or lattice shell based on a network of great circles(geodesics) on the surface of a sphere. The geodesics intersect to form triangular elements that have local triangular rigidity and also distribute the stress across the structure. When completed to form a complete sphere, it is a geodesic sphere. A dome is enclosed, unlike open geodesic structures such as playground climbers.Typically a geodesic dome design begins with an icosahedron inscribed in a hypothetical sphere, tiling each triangular face with smaller triangles, then projecting the vertices of each tile to the sphere. The endpoints of the links of the completed sphere are the projected endpoints on the sphere's surface. If this is done exactly, sub-triangle edge lengths take on many different values, requiring links of many sizes. To minimize this, simplifications are made. The result is a compromise of triangles with their vertices lying approximately on the sphere. The edges of the triangles form approximate geodesic paths over the surface of the dome.Geodesic designs can be used to form any curved, enclosed space. Standard designs tend to be used because unusual configurations may require complex, expensive custom design of each strut, vertex and panel.See the related link.
Eight triangles of equal size form a regular octagon.
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