Gabriel was installing a fence around his rectangular pool. His pool has a length 1,254 cm. and a width of 978 cm. How much total fencing did he use to enclose his pool? *

If Gabriel is going to have a fence right at the edge of his pool, (2*1254) + (2*978). That is the perimeter of the pool, but I would suggest that the fence would be some distance from the edge.