直角三角形的两个直角边之间的关系很重要。

The relationship between the two legs of a right triangle is important.

直角边直角三角形除斜边之外的两条边的任意一条.

Either side of a right triangle that is hypotenuse.

构造一个直角三角形（斜边c已给定），使斜边上的中线长度是两直角边长度的比例中项。

Construct a right triangle with given hypotenuse c such that the median drawn to the hypotenuse is the geometric mean of the two legs of the triangle.