Thee formula for perimeter is P = 2L + 2W. We know the P is 352 and the L is 98, so fill in the formula accordingly: 352 = 2(98) + 2W and 156 = 2W so W = 78
As AB and ED are parallel, they have the same slope. This means that since lines that are colllinear with parallel segments are parallel, lines l and m are parallel.