There is no specific term.
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The best way to find the volume of an irregular shape is to split it up into shapes that you know, find the volumes of those individual pieces, and then add up all of the volumes of the split pieces to get your total volume of the irregular shape.
split it up into two shapes. if there is a square and rectangle in the irregular shape split it up and find area of square and area of rectangle and add them. there now Sign in to be notified when this answer changes. You'll also enjoy the full benefits of being part of the Answers.com community.
It could be any irregular shape whose sides add up to 36cm as for example a scalene triangle
look it up in a math book
You break it up into smaller shapes which are less irregular. If these are more regular, you can calculate their contribution to the perimeter, and their area. You can then add these together.