Calculate area, perimeter, circumference, surface area and volume for common 2D and 3D geometric shapes.
Rectangle: Area = length × width
Square: Area = side²
Circle: Area = πr²
Triangle: Area = ½ × base × height
Parallelogram: Area = base × height
Trapezoid: Area = ½(a + b)h
Cube: Volume = side³
Cuboid: Volume = length × width × height
Cylinder: Volume = πr²h
Cone: Volume = ⅓πr²h
Sphere: Volume = 4/3πr³
