An alien is a person from Another Country. You probably have alien neighbors, that is, people from other countries.
"Aliens" is also used for living beings from other planets. It is not yet confirmed that this kind of aliens exist, so we can't know where to find them, if they do exist.
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You need either two sides given, to find a third side. Or > you need one side and an angle, to find another side.
A radius of a regular triangle is 12 . find the length of one side of the triangle?
Using trigonometry and Pythagoras' theorem.
the Pythagorean theory
All four sides of a square are of equal length. To find the area, you square the length of one side. To find the length of one side from the given area, find the square root of the area. In this case, the square root of 25 is 5. Hence, the length of a side is 5 yards.