It is a way to approximate a definite integral using trapezoids.
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In general an Isolated footing has three parts. One Rectangular part another is Trapizoidal part and rest is Pedestrial part. The volume of concrete of rectangular part if AXBXH. The concrete volume of Trapizoidal part is h/3( AXB + aXb+ Sqrt(AXBXaXb) where h= Thickness of Trapizoidal portion, A & B are the dimensions of Bottom face and a & b are the dimension of top face. The volume of Pedestrial portion is aXbXD where D id depth of Pedestrial portion. Sum of three calculation gives you the volume of concrete of Isolated footing.
is a method that have a rule
Not clear if this is about the word ‘rule’, or about something called the word rule.
Tan-Ad rule and Co-op Rule
The American Bystander Rule is more dominant in the U.S.