直角

It is because our footsteps are free and random, which just could not be repeated. It is not like the straight lines or right angles in the city that are designed by the draftsman with a ruler.

因为我们的足迹是自由的，不确定的，和无法重复的，而不像城市里的直线，直角，和在绘图员在他们的图板上用直尺规划的生活完全吻合。

On conic optimization, we work over some properties of cone and its dual cone, and solve the relations between special cones (obtuse cone, orthogonal cone, superior and inferior obtuse cones) and their dual cones.Furthermore, sufficient and necessary condition under which they exist are proved detailed .

本文围绕锥规划问题，对锥及其对偶锥的性质进行了研究，解决了一些特殊锥(钝锥、直角锥、优劣钝锥)及其对偶锥之间的关系，并对它们存在的充要条件给予了详细的证明。

For example, if you draw a triangle on a flat piece of paper the sum of its angles is equal to two right angles (as you know from elementary geometry ).

比如说，如果你在一张平坦的纸张上画一个三角形，它所有内角之和等于两个直角之和（如你从初等几何中所知的）。

This is a right triangle(isosceles triangle/ equilateral triangle).

这是一个直角三角形。

There are four right-angle and four equilateral in a square.

正方形有四条等边和四个直角。

Square has four equilateral side and four right angle.

正方形有四条等边和四个直角。

A square has four equilateral sides and right angles.

正方形有四条等边和四个直角。

Square has four equilateral sides and right angles.

正方形有四条等边和四个直角。

Square has four equilateral, and the four right-angle.

正方形有四条等边和四个直角。

The squire has four equilateral and four right angles.

正方形有四条等边和四个直角。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。