Justin is using the figure shown below to prove pythagorean theorem using triangle similarity: in the given triangle abc, angle a is 90o and segment ad is perpendicular to segment bc. which of these could be a step to prove that bc2 = ba2 + ca2? a. by segment addition, dc plus ad is equal to bc. b. by segment addition, dc plus ad is equal to ab. c. by segment addition, dc plus bd is equal to bc. d. by segment addition, dc plus bd is equal to ab.