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Let us recall the definition of an isosceles triangle. An isosceles triangle is a triangle with two equal or congruent sides. In this definition, it is not stated that it has exactly two equal sides. An equilateral triangle has three equal or congruent sides. If it has three equal sides, then it must have two equal sides. Therefore, an equilateral triangle is considered as an isosceles triangle. But, an isosceles triangle is not necessarily an equilateral triangle.
Sure, that is exactly what the triangle inequality tells us!
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.
There are at least 8 different "measures" that we can think of for any triangle: three sides, three angles, a perimeter, and an area. We can't guess which one you're looking for. A 'scalene' triangle is simply any triangle in which no two sides are the same length. That fact doesn't help us.
That the charge of iron is +3 resulting in a formula of Fe2(SO4)3