Question 857823
Total matterials used is 1.3m^2 
Diamitar 36cm

I need the total height of a cylindar (punching bag)  style.
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{{{Vol = pi*r^2*h}}}
Vol = 1.3 (cubic meters, not m^2)
Vol = 1300 liters = 1300000 cc
r = 18 cm
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{{{1300000 = pi^18^2*h}}}
{{{h = 1300000/(324*pi)}}}
h =~ 1293 cm = 12.93 meters
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If you mean 1.3m^2 surface area:
1.3 m^2 = 13000 cm^2
Each end is {{{pi*r^2 = 324pi}}} cm^2 =~ 1017.87 cm^2
2 ends --> 2035.74
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Lateral area = 2*pi*r*h = 36pi*h = 13000 - 2035.74
h = 10964/(36 pi)
h =~96.95 cm = 0.97 meters