Zoe is using the figure shown below to prove Pythagorean Theorem using triangle similarity: In the given triangle ABC, angle A is 90° and segment AD is perpendicular to segment BC.
A
A
B
D
С
Which of these could be a step to prove that BC2 = AB? + AC2? (6 points)
By distribution, AC2 plus AB2BC multiplied by the quantity DC plus AB.
By distribution, Acplus AB2 = BC multiplied by the quantity DC plus BD.
By distribution, Ac? plus AD2 = BC multiplied by the quantity DC plus AB.
By distribution, Acplus AD2 = BC multiplied by the quantity DC plus BD.