I would take lateral height as it is shorter, if you take a right angle, the base would be the ground , the hypotenuse would be slant edge and the height would be the lateral side!.
hypotenuse is the largest among three, that is , slant edge is the largest among three!.
so when you’re dividing fractions alwayes apply keep change flip keep the 4/1 change the division sign to a multiplication sign and flip 1/2 To 2/1 and 4/1 times 2/1 is 8