We can use the same formula we use to calculate the area to find both the base and height. However, we need to already know the value of the area and the value of either the base or the height if we’re going to the counterpart. For example, if the area and base are both known, this means we can solve for the height. If the area and height are known, we can solve for the base. All we need to do is use our original area formula.