United farm workers leader who has been called a “saint” by admirers

The correct answer for this question is this one: "Cesar Chavez." Cesar Chavez is a United Farm Workers leader who has been called a “saint” by admirers. He was an American farm worker, labor leader and civil rights activist, who, with Dolores Huerta, co-founded the National Farm Workers Association.

S^2 = a4^2 = a4 * 4 = a16 centimeters = area of the square