Determining if three side lengths can make a triangle is easier than it looks. All you have to do is use the Triangle Inequality Theorem, which states that the sum of two side lengths of a triangle is always greater than the third side. read more
Here is another (slightly faster) way to solve an SSS triangle: use The Law of Cosines first to calculate the largest angle ; then use The Law of Sines to find another angle; and finally use angles of a triangle add to 180° to find the last angle. read more