the formula for the area of a triangle is:
hb/2
so if the area of a triangle is 56 you can say:
hb/2 = 56 ⇒ hb = 112
now you can find the numbers of h and b:
they can be: 56 and 2
they can be: 28 and 4
they can be: 16 and 7
they can be: 14 and 8 :))
i hope this is helpful
have a nice day