Of course not! There are obtuse and acute triangles.
Six equilateral triangles are found in a regular 6 sided hexagon
similar triangles have all the same angles in each of them, and their sides can be of any length
Only if it is a regular tetrahedron, regular octahedron, or regular icosahedron. All other geodesics have isosceles triangle faces, not equilateral triangles.
This question is based on a misunderstanding of facts. A triangle can be but need not be a regular polygon. In fact most triangles are not regular: only equilateral triangles are.
pyramid
A lot of triangles (20) in a very roughly spherical layout. See attached link for an image of a regular icosahedron.
you can split a regular hexagon into 6 triangles
They are Similar triangles if they have the same angles. it they are exactily the same they are Equaltrial.
Of course not! There are obtuse and acute triangles.
Six equilateral triangles are found in a regular 6 sided hexagon
The faces of octahedra are triangles.
They have equal sides and angles
It has four triangles and a square.
A bow-tie type connection of 2 triangles.
similar triangles have all the same angles in each of them, and their sides can be of any length
Only if it is a regular tetrahedron, regular octahedron, or regular icosahedron. All other geodesics have isosceles triangle faces, not equilateral triangles.