_:n65170c83aa7e419ba965a184e19f80b1xb7
<http://schema.org/text>
"Differentiate with respect to r ONLY\r\n\r\ndV/dr = (2/3)pi r H   @ r = a\r\n     = (2/3) pi a H\r\n\r\nUsually when you talk about rates it is with respect to time. If you knew the rate that r was increasing, you could multiply it by dV/dr above to get that rate."
<https://www.jiskha.com/questions/295746/find-the-instantaneous-rate-of-change-of-the-volume-v-1-3-pi-r-2-h-all-put-together-of>