Hillary is using the figure below to prove pythagorean theorem using triangle similarity in the given triangle c angle a is 90° and segment a. d. is perpendicular to segment bc which of these could be a step to prove that bc^2= ab^2 + ac ^2?
a. by the addition property of a equality, ac2 plus ad2= ab multiplied by dc plus ad2
b. by the addition property of equality, ac2+ad2 = bc multiplied by dc plus ad2
c. by the addition property of equality, ac2 plus ab2=ab multiplied by dc plus ab2
d. by the addition property of equality, ac2 plus ab2 = bc multiplied by dc plus ab2