You know, cosine is adjacent over hypotenuse.

你们知道 cos是邻除以斜。

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，两分别长 a 和 b，斜长 c。

Arrange them so that their hypotenuses form a tilted square.

将它们排列起来，使其斜一个倾斜的正方。

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

我懂了，正弦是斜。是的。

Opposite over hypotenuse is equal to sine of an angle.

斜分之 的值即是 sin 函数的值。

And so this is going to be equal to what?

相于这个角 这里是邻/斜？

Root 2 simply is the hypotenuse of a right triangle

而 √2 只是两长度为 1 的 直角三角之斜。

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

几何最著名的关系是直角三角的和斜之间的关系。

So this is equal to cosine of the angle.

cosθ等于邻/斜。

So you have the opposite over the hypotenuse.

这里是斜。

What involves the hypotenuse and the opposite side?

什么涉及斜和？

So what involves the opposite and the hypotenuse?

那么什么涉及立面和斜呢？

They looked like real stones because of the way they were cut-flat with beveled edges.

它们看起来像真正的石头， 因为它们被切割带有斜的平整方式。

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我给惊呆了。

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。

Sine theta equals opposite over hypotenuse.

正弦θ等于除以斜。

Cosine theta equals adjacent over hypotenuse.

cosine theta 等于相邻在斜上。

When you draw a vector, it's a lot like the HYPOTENUSE of a right angle triangle.

当你画一个箭头时，它很像 直角三角的斜。

For the fundamental with two fixed ends, we already know that the wavelength is twice the string's length.

于主要的两个固定侧，我有 我们知道波长是斜长度的两倍。

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。