Calculate area, perimeter, volume, and surface area for common geometric shapes.
Circle: Area = πr², Circumference = 2πr
Rectangle: Area = l×w, Perimeter = 2(l+w)
Triangle (Heron's): Area = √(s(s-a)(s-b)(s-c)) where s = (a+b+c)/2
Sphere: Surface = 4πr², Volume = (4/3)πr³
Cylinder: Volume = πr²h, Total Surface = 2πr(r+h)
Cone: Volume = (1/3)πr²h, Slant = √(r²+h²)
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