+97 Differentiated Equation:
dA/dr=(2*(pi^2*r^6-64800)/(r^2sqrt(pi^2*r^6+129600)))
Let dA/dr=0
Therefore: 0=(2*(pi^2*r^6-64800)/(r^2sqrt(pi^2*r^6+129600)))
Find 'r', with working, please :)?
NOTE: In the original question, the 'r' value will represent the radius in the volume formula of a cone. Resulting in finding 'h' value of the formula.
Known infomation of the volume formula:
V=120ml
so, 120=1/3 pi*r^2*h
Thanks again, ask any questions if it is not clear.
