It is the side opposite the right angle. It is also the longest side.
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You can't. The hypotenuse alone isn't enough to tell you anything about the lengths of the legs. There are an infinite number of different right triangles that all have the same hypotenuse but different legs.
In a right angle triangle the square of the hypotenuse is equal to height squared plus base squared
You can't. The hypotenuse alone isn't enough to tell you anything about the triangle. There are an infinite number of different right triangles that all have the same hypotenuse. In order to find anything else, you also need to know either the length of one leg, or else the size of one acute angle.
The smaller the angle, the smaller the side opposite it.
5.7735 cm is the length of a side so 1/2 x base x Height should give you an answer. Remember, the apothem makes two mirrored 30 60 right triangles...Pythagoras will tell you how to find the hypotenuse...that will be the unknown side of the equilateral.