Question

The volume of a roller is 4435.2 cubic cm and its height is 20cm find the radius of base​.
with proper working.

Answer 1

$\huge\underbrace\bold\red{ Answer }$

$given \: \: as-$

$V=πr {}^{2} h$

$∴πr {}^{2} h=150π$

$⇒r {}^{2} =150/6$

$⇒r=25=5$

$Therefore,$

$Lateral \: surface \: area =$

$2πrh=2×π×5×6 \\ =60πcm2$

$Total \: \: surface$

$area =2πr(r+h)= \\ 2×π×5×(5+6) \\ =110πcm2$