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The letter on the front will be W. The letter on the bottom will be X.
An isometric triangle is a 3 dimensional triangle shown on a flat surface or in 2 dimensions.
x * y * z (* means multiply)
This is easiest shown through integration. If you don't know how to do integration, divide the pyramid into many thin layers, and assume that each is a rectangular block. Try to do this experiment with the help of a spreadsheet like Excel.
bc = ad = 75 Tan adb = 160/75 = 2.1333 (4dp), so angle adb = 64.885°.