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January 31, 2015

January 31, 2015

Posted by **JOY** on Tuesday, May 24, 2011 at 10:26am.

Round to the nearest tenth.

I need to find -

Find Lateral Area

and

Find Surface area

- geometry -
**Jai**, Tuesday, May 24, 2011 at 10:35amrecall that lateral area (area on the sides, not the top or the bottom) of a cylinder is given by,

LA = 2πrh

where

r = radius

h = height

π = "pi" equal to 3.14 (constant)

substituting,

LA = 2*(3.14)*5*22

LA = 690.8 cm^2

recall that the surface area of cylinder is the sum of the lateral area and area of the base, given by

SA = 2πrh + 2πr^2

where

r = radius

h = height

π = "pi" equal to 3.14 (constant)

substituting,

SA = 2*(3.14)*5*22 + 2*(3.14)*5^2

SA = 847.8 cm^2

hope this helps~ :)

- geometry -
**JOY**, Tuesday, May 24, 2011 at 10:58amThank you so much!

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