So what we'd wanna come up with is a relationship between dh dt, d theta dt, and maybe theta if we need it. Or another way to think about it, if we can come up with a relationship between h and theta, then we could take the derivative with respect to t, and we'll probably get a relationship between all of this stuff. So what's the relationship between theta and h? Well, it's a little bit of trigonometry. We know, we're trying to figure out h. We already know what this length is right over here. We know opposite over adjacent, that's the definition of tangent. So let's write that down.