Yes: it's called a tetrahedron. If you're an algebraic topologist, you can also call it a 3-simplex.
square
It is a triangular prism
isoceles, equilateral, and scalene...
acute, isosceles right, obtuse, and equilateral
Triangles with three equal sides are called equilateral triangles.
This shape is called a Icosahedron , I think.
square
It is a triangular prism
isoceles, equilateral, and scalene...
equilateral and scalene
equilateral, isosceles and scalene.
acute, isosceles right, obtuse, and equilateral
There are: Isoceles, Right, Scalene, and Equilateral.
Triangles with three equal sides are called equilateral triangles.
Such are usually called equilateral triangles.
a regular octahedron
tri as in 3 angles as in the ends . He's right but i wil explain more. Equilateral triangles get there name from all sides being equal hence the name equilateral. Right triangles get there name from having a right angle, or ninety degree angle. I don't know about iscoceles.