What is the developed width formula for a U-channel?

The developed width formula for a U-channel calculates the flat length of the material needed to form the U-channel. In this context, BA represents the base width of the U-channel, while BTLD1 and BTLD2 are the lengths of the two vertical legs that connect to the base.

The reasoning behind the formulation is based on how the channel is constructed; when the material is laid flat before bending, the total width encompasses the base width plus the lengths of both vertical sides. Therefore, incorporating BA plus BTLD1 and BTLD2 captures all necessary parts of the channel that will later fold into the desired U shape. This makes the formula particularly useful in ensuring that there is enough material to account for both vertical segments and the base when fabricating the channel.

The inclusion of BTLD1 and BTLD2 alongside BA in this specific order reflects the logical sequence of laying out the channel's components on a flat sheet.