# Volume and SA of a cylinder.

• May 11th 2010, 05:05 AM
thierryvoomhenry
Volume and SA of a cylinder.
i have a cylinder here i need to find the volume and the surface area

the cylinder is 4cm base height 15cm

would the volume be 3.14 x 42 x 15 = 753.6 i have to give the answer to 3 significant figures so 754cm.

and would the surface area be

2 x 3.14 x 4 x 15 + 2 x 3.14 x 42 = 194.68 i have to give the answer to 2 siginificant figures so 190cm!

is that right?????
• May 11th 2010, 06:15 AM
Sudharaka
Quote:

Originally Posted by thierryvoomhenry
i have a cylinder here i need to find the volume and the surface area

the cylinder is 4cm base height 15cm

would the volume be 3.14 x 42 x 15 = 753.6 i have to give the answer to 3 significant figures so 754cm.

and would the surface area be

2 x 3.14 x 4 x 15 + 2 x 3.14 x 42 = 194.68 i have to give the answer to 2 siginificant figures so 190cm!

is that right?????

Dear thierryvoomhenry,

The volume is correct. But you should better check the surface area. It should be, 477.28

• May 11th 2010, 07:10 AM
unstopabl3
Hmmm, I am pretty sure the formulas are as following: