If it's a perfect box that doesn't matter he will just multiply any measure by herself three times, but if it's like a rectangular box it will matter because he will need to multiply every measure to the other. I would say Maybe.
Line DQ is equal to 7. Since point Q is the centeriod, this means that line DQ will equal the same as line QD. Thus, line QD is 7 making like DQ 7 as well. Hope that helped :))