use speed time formula...
I've never heard of that.
related rates right?
Yeah, related rates.
\(A=\pi r^2\) and so \(A'=2\pi rr'\)
you are told \(r'=1.5\) and \(r=42\) plug in the numbers and get \(A'\) in one step
wow, that was easy. I'm terrible at these.
yeah, i have to admit that one was real easy they get harder
well only the formulas get harder to figure out, i am willing to bet that you knew the formula for the area of a circle
yeah, I was just thinking like A=pi(r^t/1.5)^2 then I was super confused
That made absolutely no sense to me.
The minute hand on a watch is 8mm long and the hour hand is 4 mm long. How fast is the distance between the tips of the hands changing at one o'clock? THat's the hardest one I have done myself.