Respuesta :

queenscarl
The answer is B. 20^2 - 12^2 = a^2, as you would use a^2 + b^2 = c^2 and use 20 for c and 12 for b. Then you would subtract b from each side to isolate a, ending up with 20^2 - 12^2 = a^2.

Otras preguntas