Data Sufficiency

Hi, when i gave the actual gmat i came across a data sufficiency question in which i was given a figure similar to the below and was asked for the value of one of the interior angles.

I don't remember the exact question but i think one of the statements was:

1) abcd is an equilateral square

now, i most probably have written down the question or maybe even the stat incorrectly and if anyone is aware of this actual question or a similar pls share it with me.

during the exam i was stumped for a bit by what an equilateral square actually is. eventually, i figured a square anyways has all sides and angles equal so i guess, its kind of redundant to say "equilateral square" & the exam is generally trying to annoy me.

Anyways, if anyone has this question, please share it with me as its been in my head for a while & i keep forgetting about it only to remember it a few days later!

I've never heard of an equilateral square. Am interested to know whether someone else has

"Equilateral" means "all sides are equal". A square is an equilateral rectangle.