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Are you talking about a pipe stem triangle? It's composed of twisted wire running through three clay pipes in the shape of an equilateral triangle. It is placed on an iron ring attached to a ring stand, and is used to hold a crucible over the flame of a Bunsen burner.
The opposite over the hypotenuse.
anything over 180, A triangle is composed of 180 degrees, so if one angle alone is 180 degress then the shape is not A triangle.
the tangent of an angle is opposite over adjacent side of triangle
Sin is the opposite over the hypotenuse.