Is this right if not tell me answer pls

It is wrong because you forgot to get the area of the base which should be 16, not 4. 4 is one side of a SQUARE base. hope this helps

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.