I get it! Sin is opposite hypotenuse... Yes.

，正弦是对比斜。是的。

You know, cosine is adjacent over hypotenuse.

你们知道 cos是邻除以斜。

Root 2 simply is the hypotenuse of a right triangle

而 √2 只是长度为 1 的 直角三角之斜。

Opposite over hypotenuse is equal to sine of an angle.

斜分之对 的即是 sin 函数的。

So you have the opposite over the hypotenuse.

这里是对比斜。

Arrange them so that their hypotenuses form a tilted square.

将它们排列起来，使其斜成一个倾斜的正方。

Take four identical right triangles with side lengths a and b and hypotenuse length c.

取四个全等的直角三角，分别长 a 和 b，斜长 c。

And this comes straight out of this magnitude, which is opposite to the angle over the hypotenuse.

这是因为这个向量，让它的量当分母。

The most famous relation in geometry is the relation between the sides and the hypotenuse of a right triangle.

几何中最著名的关系是直角三角的和斜之间的关系。

What involves the hypotenuse and the opposite side?

什么涉及斜和对？

After the hymn, the teacher taught students the hypotenuse.

赞美诗后，老师教学生直角三角的斜。

So what involves the opposite and the hypotenuse?

那么什么涉及对立面和斜呢？

It's adjacent over hypotenuse. And that's square root of 3 over 2.

它在斜上相邻。那是 3 除 2 的平方根。

You know, I was blown away that the square of the hypotenuse was the sum of the squares of the opposite sides.

斜平方等于直角平方和可把给惊呆。

That states that the squares of the sides of a right triangle add up to the square of its hypotenuse.

这表明直角三角各的平方加起来等于其斜的平方。

They all came up with elegant proofs for the famous Pythagorean theorem; the rule that says for a right triangle, the square of one side plus the square of the other side is equal to the square of the hypotenuse.

他们都对毕达哥拉斯定理（勾股定理）做出精彩的证明；这个定理是说，对于一个直角三角，一的平方加上另一的平方等于斜的平方。

They all came up with elegant proofs for the famous Pythagorean theorem, the rule that says for a right triangle, the square of one side plus the square of the other side is equal to the square of the hypotenuse.

他们都为著名的毕达哥拉斯定理提出优雅的证明，这条规则说对于直角三角，一侧的平方加上另一侧的平方等于斜的平方。