直角

Given the lengths of the two sides of a right-angled triangle, wecan find out the length of a third side.

要是知道直角三角形两个边的长度，我们就能求出第三边的长度。

Look at Picture 3.4—2. Compare the area of Square ABCD with the sum of the areas of four same right-angled triangles , and what inequality can you have?

阅读课本 P110，比较图3.4－2中正方形 ABCD 的面积与4个全等的直角三角形的面积之和的大小，你能得到怎样的不等式？

A right-angled optical prism used to ''.

用来垂直翻转图像的直角光学棱镜。

This is very handy to rotate pictures of right angles, for example from portrait to landscape or vice versa.

这在直角旋转照片的时候是非常方便的，例如从肖像转到风景，反之亦然。

If you have a spinning gyroscope and you try to rotate its spin axis, the gyroscope will instead try to rotate about an axis at right angles to your force axis; this is precession.

如果您有纺纱陀螺仪和您尝试旋转，其旋转轴，陀螺反而会尝试旋转约一轴成直角，以您的力量轴；这是岁差。

Next start nearest to the boss and using a straight edge or ruler draw a line at right angle 90 Deg.

下次启动最接近老板并使用直边或统治者绘制在直角线

But I could find no saltpeter; indeed, no nitrates of any kind.

探寻中我又发现了一个和第～条长廊成直角的短走廊。

Had the acute-angled rabble been all, without exception, absolutely destitute of hope and of ambition, they might have found leaders in some of their many seditious outbreaks, so able as to render their superior numbers and strength too much even for the wisdom of the Circles.

有急性直角乌合之众已全部，没有例外，绝对的希望和野心贫困，他们可能会发现他们的许多煽动爆发的一些领导人，以便能够以使他们的优势和力量人数太多，甚至的智慧圆圈。

Shoulder --shoulderblade well laid back. Upper arm equal in length to and forming a nearlyright angle with the shoulder blade.

肩胛：肩胛骨向后倾斜，上臂骨的长度与肩胛骨大致相等，且上臂骨与肩胛骨形成接近直角的角度。

The angle at the vertex P of triangle O1PQ1 is equal to the angle at the vertex P of triangle O2PQ2, so these two right triangles are similar.

三角形O1PQ1中顶点P的角度等于三角形O2PQ2中顶点P的角度，因此这两个直角三角形是相似的。

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。