Rotary cylinder 2

Base circumference of the rotary cylinder has same length as its height. What is the surface area of cylinder if its volume is 250 dm3?

Correct result:

S =  248.64 dm2

Solution:

h=2πr V=πr2h=πr22πr=2pi2r3=250 r=V2π23=2.33 dm h=2πr=14.65 dm  S=2πr2+2πrh=248.64 dm2



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