Answer:
7 is all the sides
Step-by-step explanation:
If the height is 5, and the area is 35, use the formula a=b*h where a is area, b is base, and h is height. 35=b*5, b=7. So if the base is 7, use the formula p=2b+2l, where p is perimeter, and l is length. 28=2*7+2l. 28=14+2l. 14=2l.
l is 14.
