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equalataril, right-angled, scaline and issossalies
Because the Bottom left corner makes a 90 degree angle like this |_ and a 90 degree angle is called a Right angle thus the name Right angled Triangle
It would most commonly be called a box. Properly, it is called a rectangular prism. It is also a right-angled parallelepiped.
"Equilateral" means having equal angles. So an equilateral triangle has all three angles the same size. "Equilateral" is the normal word for this, though you could say "equal-angled".
A cone by definition has only two sides. A five-sided pyramid can refer to either a square-based pyramid (four angled sides and the base) or a pentagonal-based pyramid (five visible sides).