Could the length of a shape be 38 cm while still having the area as 19cm²?

Yes

Step-by-step explanation:

In case of a shape such as a rectangle, if the length is 38 and the width is 0.5 cm since we know that area of a rectangle is given as the product of length and width then it means A=lw where l is length and w is width. In that case, the area will be 38*0.5=19 cm²

Similarly, for a triangle whose length is 38 but base is 1 cm the area will be given by 0.5bh where base is the length and h is the height. We still get area of 38 cm²