Used to give an approximate size comparison rather than an exact measurement.
“It's roughly the size of a basketball, maybe a little smaller.”
“The whole thing is roughly the size of a microwave oven.”
Since you likely won't know the exact measurements of the object in Task 8, 'roughly the size of' is essential for giving the listener a useful size reference without guessing at numbers. Always follow it with a common object everyone knows, such as 'roughly the size of a shoebox.' This phrase alone can cover the entire size-description requirement of the task.
Synonyms: about the size of, approximately as big as, similar in size to