The area of a square is calculated by squaring the length of one of its sides. If the area of Roslyn's bedroom is 196 square feet, we can find the length of one side (which is also the length of each side since it's a square) by taking the square root of the area.
So, the length of each side would be $$\sqrt{196} \, \text{feet} = 14 \, \text{feet}$$.
Therefore, the dimensions of Roslyn's bedroom are 14 feet by 14 feet. I hope this helps! Let me know if you have any other questions.