Answer :
I’m not quite sure if you are saying each side is 7 or 77 so I did both.
If the side length is 7, then 9.9 is the answer.
If the side length is 77, then 108.9 is the answer.
I’m not quite sure if you are saying each side is 7 or 77 so I did both.
If the side length is 7, then 9.9 is the answer.
If the side length is 77, then 108.9 is the answer.