Why is the fruit round

All kinds of fruits we have seen are almost round-spherical, Oval and cylindrical. Why is the fruit round instead of square?

Botanists told us that among all the objects with the same volume, the area of the circle is the smallest. If the fruit grows itself into a "circle", the water evaporation on its surface will be small, which is beneficial to its growth and development. Just because the fruit is round, it can also minimize the damage of bad wind to oneself.
Thinking: small fruits all know how to "shrink" their appearances and "strengthen" their hearts. A truly capable person will also know how to restrain his own edge and strengthen himself gradually.