Question

TO
pardie siues are wouli eyu
The radius and the height of a cylinder are in the ratio 7:2. If the volume of the
cylinder is 8316 cm", find the surface area of the cylinder.​

Answer 1

Answer:

$792cm^2$

Step-by-step explanation:

$Given,$

$r:h=7:2$

$So,let\\r=7x\\h=2x$

$Volume=$$8316 cm^3$

 $8316=\frac{22}{7}*(7x)^2*2x\\ 8316=*7/22=49x^2*2x\\2646=98x^3\\x^3=27\\x=3$

$Now,$

$r=7x\\ r=7*3=21 cm\\h=2x\\=2*3=6cm$

$CSA=2\pi rh\\CSA = 2*\frac{22}{7} *21*6\\CSA = 792 cm ^2$