古希腊几何学家海伦(Heron)在著作《度量》中提出并证明了已知三角形三边长求面积公式:用a,b,c表示三角形的边长,p表示三角形的半周长,则三角形的面积S=p(p-a)(p-b)(p-c),这个公式结构简单,具有轮换对称的美感,让人看一眼公式便铭记在心,并激起人们思索的欲望,后来有人发现并证 The ancient Greek geometrist Heron proposed and proved in the book “Measurements” that the length of a triangle on the known triangle is given by: a, b, c, where p is the half-circumference of the triangle, and the triangle The area of ​​S = p (pa) (pb) (pc), the formula is simple in structure, with a rotational symmetry of the beauty, people look at the formula will be remembered, and provoke people’s desire to think, and later was found and evidence