We're gonna keep it pi over four, because when you take derivatives of trig functions, you assume that you're dealing with radians. So right over here, this is pi over four radians. And you also are able to measure the rate at which this angle is changing. So this is changing, changing, changing at 0.2 radians per minute. Now, my question to you, or the question that you're trying to figure out as you watch this hot air balloon is how fast is it rising right now? How fast is it rising just as the angle between the horizontal and kind of the line between you and the hot air balloon is pi over four radians, and that angle is changing at 0.2 radians per minute? So let's think about what we know and what we're trying to figure out.