Question

the curved surface area of a cylinder pillar is 440 CM square and its volume is 1520 cm find the height of pillar

Answer 1

Given,2πrh=440 cm........(1)
πr×r×h=1520 cm........(2)
(2)÷(1)
π×r×r×h ÷ 2πrh =1520÷440
r÷2= 1520÷440
r= 1520×2÷440
r=6.9 cm
2π×6.9×h=440
h=440×7÷6.9×2×22
h= 3080÷303.6
h= 10.1 cm ( approximately)

Answer 2

given c.s.a of cylinder 440 cm and volume 1520 now let us equate 2.22/7.r.h equal to 440 by transposing 2 we get 22/7.r.h equal to 440/2
$therefore \pi \times r \times h = 220 = rh = 220 \times 3.14 =$
equals to 690.8 now height 'h' is 690.8÷r