landon is writing a coordinate proof to show that the diagonals of a square

I need help with Geometry NOT algebra. There are 15 question that need to be answered, I have listed the first 5.

Which statement can be used to prove that a given parallelogram is a rectangle?
All the sides of the parallelogram are equal in measure.
The consecutive angles of the parallelogram are supplementary.
The diagonals of the parallelograms are congruent.
The diagonals of the parallelogram are perpendicular.
Parallelogram ABCD is a rectangle.
A
B
х
AC = 2y +7
BD = 3y – 4
D
What is the value of y?
Enter your answer in the box.
y =
А
B
Parallelogram ABCD is a rectangle.
Which statements are true?
Select each correct answer.
x
AC = BD
D
с
OAB I BC
O AC = AB
AC I BD
Drag and drop the correct answer into each box to complete the proof.
Given: Rectangle ABCD
Prove: AC BD
B
D
Statement
Reason
Given
Rectangle ABCD
AD BC
Reflexive Property of Congruence
Definition of rectangle
ZADC and 2BCD are right angles.
ZADCE ZBCD
SAS Congruence Postulate
CPCTC
DC DC
AD AD
AC BD
ΔACD =Δ BDC
AADC ABCD
Definition of perpendicular lines
Angle Congruence Postulate
Opposite sides of a rectangle are congruent.
All right angles are congruent.
А
ST
B
Parallelogram ABCD is a rectangle.
CX = 3y – 4
BD = 2y
x х
D
с
What is the value of y?
Enter your answer in the box.
y =