No, the shape will not be a square.

If your answer does not match our answer,

• did you print the sketch and label the side lengths of squares C and D?
• if you know the area of a square, can you find its side length?
• if you know the side lengths of C and D, can you figure out any other side lengths?

If your answer does match ours,

• have you clearly shown and explained the work you did?
• are you confident that you could solve another problem like this successfully?
• did you make any mistakes along the way? If so, how did you find and fix them?
• are there any hints that you would give another student?
• does this problem remind you of experiences you've had?