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
equilateral and scalene
isoceles, 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
A triangle is a 2-dimensional closed shape (called a polygon) with 3 sides. The three sides form a closed shape with three interior angles, hence the name "tri-angle." There are three general types of triangles: they are called Acute, Obtuse, and Right Triangles. Acute Triangles contain interior angles that are all less than 90 degrees. Obtuse Triangles contain one (and only one) interior angle that is greater than 90 degrees. Right Triangles contain one (and only one) angle that is exactly 90 degrees. There are also sub-types of triangles; the most common sub-types are Equilateral and Isoscles Triangles. The interior angles of Equilateral Triangles are all 60 degrees. At least two interior angles of Isoscles Triangles are equal to each other.