Formula For Area Calculation

Draw a stretchout of the part. Calculate from there.

Hi.. Thanks for your reply. Actually, i want to calculate exactly. There must a be formula for that, Could u please elaborate the formulae for calculating the area of 90° Rectangular elbow duct. Thanks

Hello Muthu

It is obvious this is a homework question, so let us do this:

Have you calculated the area of the two straight legs? Do so.

Have you calculated the area of the side pans (the pie shaped pieces on the sides)? Go ahead and do so.

Have I forgotten anything? If I have, be certain to correct my omission.

Now, add the areas together. This is appropriate for a tight 90^0, with curved outside pan. If an extended 90⁰ or a plain square 90⁰, there is more figuring to do, but you should be able to go from here.

Reduce the problem to smaller parts, and it is easier to see and solve.

The group will probably scold me for helping this much. Good luck with your studies.

Calculate like two seperate rectangles width times length times height plus width times lingth times height. This would be your total area.

Unless the corner is rounded.

Hello mrclean. Welcome to the asylum.

In your post you said "...two seperate rectangles width times length times height plus width times lingth times height. This would be your total area."

Would that not give me the volume? Solution should be CM², not CM³.

You are correct Doorman sorry, I had a brain fart. Trying to work and reply both at the same time doesn't always work.