The cylinder

The cylinder has a surface area of 300 square meters, while the height of the cylinder is 12 m. Calculate the volume of this cylinder.

Correct result:

V =  374.381 m3

Solution:

S=300 m2 h=12 cm  S=2pir2+2pirh  300=2 3.1415926 r2+2 3.1415926 r 12 6.2831852r275.398r+300=0 6.2831852r2+75.398r300=0  a=6.2831852;b=75.398;c=300 D=b24ac=75.398246.2831852(300)=13224.7141811 D>0  r1,2=b±D2a=75.4±13224.7112.5663704 r1,2=6±9.15131049315 r1=3.15131049315 r2=15.1513104931   Factored form of the equation:  6.2831852(r3.15131049315)(r+15.1513104931)=0  r=r1=3.15133.1513 S1=π r2=3.1416 3.1513231.1984 m2  V=S1 h=31.1984 12374.3807374.381 m3   Correctness test:  S2=2π r2+2π r h=2 3.1416 3.15132+2 3.1416 3.1513 12=300 S=S2

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