392.4 in2 should be correct
example of a net...
Do 51 and 2.5 then when you get that add 42 to your answer
She’s incorrect I’m pretty sure u divide 20 and 60.
A net is just a 3D shape made into a 2D shape. So when you have a net, it is easier to make sure you count up all the sides without missing one or counting one twice.
plz mark brainliest if it helps