QUESTION MARKS ARE WHAT I NEED FILLED IN, WILL GIVE BRAINLIEST.

Given: A B C D is a square.
Prove: The diagonals of A B C D are perpendicular.

The coordinates of square ABCD are A(0, 0) , B(a, 0) , C(????
, a), and D(0, ???).

The slope of AC¯¯¯¯¯ , when simplified, is equal to ????

.

The slope of BD¯¯¯¯¯, when simplified, is equal to −1 .

The product of the slopes is equal to ????

.

Therefore, AC¯¯¯¯¯ is perpendicular to BD¯¯¯¯¯.