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Is ABCD a parallelogram? Is there any more given information?
@mathstudent55 yes it is. Sorry, if I didnt make it clear in the drawing
Is there any other given?
There's still not enough info to figure it out.
I don't think the book would make a mistake like this. I'm sure there is no other given. I'm trying to figure it out with a system of equations, but I can't figure it out completely.
All the book states is Parallelogram ABCD and the figure?
And you didn't forget to include any angle measure in the figure?
Again, I'm certain. There are no measures given besides the right angle.
I don't see a way of coming up with a number for this. There are too many unkowns.
Well, it's not in English. I doubt you'll find it anywhere. It's titled Mathematics IX, published by the Ministry of Education, Culture and Science.
What language and what country? Also, is there any possiblility you can take a picture of it or scan it?