to this:
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In order to find Lenin's square, the width of Lenin must be multiplied by the length of Lenin. But this is only the area of Lenin’s projection on the plane.
But how to find the surface area of the real Lenin, provided that it is a bit three-dimensional, and it cannot be turned?
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Let us begin with the fact that the method of multiplying length by width" is incorrect by definition, because The projection on the plane will not be a rectangle.It is necessary to either take an integral or determine the projection area by the Monte Carlo method.
Accordingly, to determine the surface area of the real Lenin, it is necessary to calculate the integral on the surface. But with this method there will be problems with the conclusion of the equations of the curves describing this surface. In practice, it is better to use another method.
Lenin must be weighed. Then paint and weigh again. Knowing the standard of paint consumption per square meter. The surface area can be approximately determined.
Your K.O.