Asked by Help please?
So I have a cylinder and I have to find the volume to surface ratio, the measurements are Radius: 2cm Height: 1.5 cm. I have volume of 18.84 and a Surface area of 225.47. Would the ratio be 18.84:225.47?
Answers
Answered by
Reiny
volume = πr^2h = π(4)(1.5) = 6π cm^3
surface area = 2 circles + a rectangle = 2πr^2 + 2πrh
= 2π(4) + 2π(2)(1.5)
= 8π + 6π = 14π cm^2
volume : surface area = 6π cm^3 : 14π cm^2 = 3 cm^3 : 7 cm^2
Usually ratios are expressed using the same units, which is not
possible here
how did you get 225.47 for the SA ??
surface area = 2 circles + a rectangle = 2πr^2 + 2πrh
= 2π(4) + 2π(2)(1.5)
= 8π + 6π = 14π cm^2
volume : surface area = 6π cm^3 : 14π cm^2 = 3 cm^3 : 7 cm^2
Usually ratios are expressed using the same units, which is not
possible here
how did you get 225.47 for the SA ??
Answered by
Steve
well, yeah.
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