To get ℓ, first you need to find h:Now you can see that the triangle is a 3-4-5 and that ℓ = 5. Now plug c =
6 π and ℓ = 5 into the lateral area formula:2 . E
Use the formula for the distance between opposite vertices:What you have is a cube, so the length, width, and height are all the same—call them each x: