Question

Pleas help double check me! Will medal!

Seth 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 = AB2 + AC2?

Answer 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.

Answer 2

I think it is #3