Question

Help!!! Will give a medal and a fan!! Need Help ASAP!!!

Answer 1

Joshua wrote the following proof to show that the diagonals of rectangle ABCD are congruent.

Joshua's proof:
Statement 1: In right triangle ADC, the sum of the squares of sides AD and DC is equal to the square of hypotenuse AC so that AD2 + DC2 = AC2 and in right triangle ABD, the sum of the square of sides AD and AB is equal to the square of hypotenuse DB so that AD2 + AB2 = DB2 (by Pythagorean Theorem)
Statement 2: AB = DC (by transitive property of equality)
Statement 3: AC2 = DB2 (from statements 1 and 2)
Statement 4: AC = DB (taking square root on both sides of AC2 = DB2)
Which statement in Joshua's proof has an error? (1 point)