Seth 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.

The figure shows triangle ABC with right angle at A and segment AD. Point D is on side BC.

Which of these could be a step to prove that BC2 = AB2 + AC2? (6 points)

Question 3 options:
1) By the cross product property, AB2 = BC multiplied by BD.
2) By the cross product property, AC2 = BC multiplied by BD.
3) By the cross product property, AC2 = BC multiplied by AD.
4) By the cross product property, AB2 = BC multiplied by AD.