please help me this is for a grade

Answer:
C. 13
Step-by-step explanation:
Answered through this calculator: https://www.calculator.net/right-triangle-calculator.html?av=5&alphav=&alphaunit=d&bv=12&betav=&betaunit=d&cv=&hv=&areav=&perimeterv=&x=61&y=31