Michael J. answered • 12/11/17

Applying SImple Math to Everyday Life Activities

You have a cylinder, so you want the formula of the surface area of this solid. The height, h, is 5cm.

SA = πr

^{2}+ 2πrh**SA = πr**

^{2 }+ 10πrYou also need to know the volume of this solid.

V = πr

^{2}hThe volume is already given to you.

πr

^{2}h = 205πr

^{2}= 20Then, from this volume equation, your radius, r, is

r

^{2}= 4 / πr = 2 / √π

Plug in this value of r into the SA formula to get the actual surface area.