直角三角形

Prepare a piece of paper, and fold it right-angled the triangle.

准备一张纸，把它折成一个直角三角形。

Expressed as a ratio of the sides of right-angled triangle containing the ''.

直角三角形各角的函数是用各边的比来表示的。

Square on longest side of a right-angled triangle equals stun of the square s on other two sides.

直角三角形最长边的平方等于另两边的平方的和。

Square on longest side of a right-angled triangle equals stun of the squares on other two side s.

直角三角形最长边的平方等于另两边的平方的和。

Given the lengths of the two sides of a right-angled triangle, we can 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。

Square on longest side of a right-angled triangle equals stun of the squares on other two sides.

直角三角形最长边的平方等于另两边的平方的和。

Fold but do not fold into a right-angled triangle the intermediate is not it?

不用对折而是把中间折叠成直角三角形是么？

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？

Note that this ratio does not depend on the particular right triangle chosen, as long as it contains the angle A , since all those triangles are similar.

把直角三角形的弦放在直径上，股就是长的弦，即正弦，勾就是短的弦，即余下的弦——余弦。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。