angle between diagonals in rectangle

[davidchn24]

ABCD is rectangle.
Can angle alpha be 90 degrees?

 

[blamocur]

View attachment 32961
ABCD is rectangle.
Can angle alpha be 90 degrees?

Sure, when ABCD is a square.

 

[Harry_the_cat]

Sure, when ABCD is a square.

And a square IS a rectangle.

 

[lookagain]

View attachment 32961
ABCD is rectangle.
Can angle alpha be 90 degrees?

This is your second post without showing any work with your post, and you were given a prompt
to show your work with your first thread/post. If you post another thread, do not just post the
problem without attempted work and/or pertinent questions about the problem, please.