Surface of the cylinder

Calculate the surface area of the cylinder when its volume is 45 l and the perimeter of base is three times of the height.

Correct result:

S =  70.0527 dm2

Solution:

V=45 l=πr2h 2πr=3h h=23πr V=23π2r3 r=3V2π23=1.9 dm h=23πr=3.98 dm S=2πr2+2πrh=2π1.92+2π1.93.98=70.0527 dm2



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