九点圆

Firstly , the following proofs are made by means of homothet-ic transformation : 1 the centre of a nine-point circle is at the midpoint of ligature of its curcumcentre andorthocentre; 2 the radius of nine-point circle is equal to half of the radius of its curcumcircle.

本文给出一个简单的证法，先用位似变换的方法证明九点圆的圆心在外心和垂心连线段的中点，九点圆的半径等于外接圆半径的一半。

Prominent in the modern elementary geometry of the triangle is the nine-point circle.

九点圆在三角形的现代初等几何中是重要的。

Prom nt in the modern elementary geometry of the triangle is the nine-point circle .

九点圆在三角形的现代初等几何中是重要的。

Then thetheorem can be proved by calculating the distances of centres between a nine-point circle and...

然后通过计算九点圆与内切圆、九点圆与旁切圆的圆心距，使定理获得证明。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。