The expression for a in terms of c is
. The correct option is the third option 
<h3>Pythagorean theorem </h3>
From the question, we are to determine the expression for a in terms of c
In the given right triangle, we can write that
(<em>Pythagorean theorem</em>)
Thus,



Hence, the expression for a in terms of c is
. The correct option is the third option 
Learn more on Pythagorean theorem here: brainly.com/question/23994492
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Answer: Isosceles Triangle (if that was what you were looking for)
Step-by-step explanation:
This question is unanswerable. Wrong attachment. :(