1). Take the information you have.
2). Collect and write down all the formulas, equations, and rules you know
that tell some kind of connection or relationship between the information
you have and the length of 'a' .
3). Use the information you have, and the relationship between that information
and the length of 'a', to find the length of 'a'.
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If there is no length for the hypotenuse you have to use the Pythagorean Theorem. If there are two sides missing and a reference angle you could use Trigonometry.
The third side can be of any length in the interval (2, 128) units of length.
To find a missing dimension of an object find the size of its covering properties.
Hhj
The length of the missing leg will be 18 units.