surface area of cylinders

Hi Joe!

Well to find the surface area of a cylinder, you have to combine the radius and pi, which is the diameter , as the area of a circle is pi.r^2 : diameter ×radius square, depending the given number of the radius in the surface area of your cylinder. when you have found pi.r^2 of the given radius, the answer you input is your surface area of your cylinder. like for example :

Radius of a cylinder is 4cm, and height is 8cm, and area of a circle is pi.r^2 just input as pi(4cm)^2 in your calculator, then the answer is your area, then to find your final answer which is your surface you multiply 2×pi(4cm)^2=your answer, that is your surface area. And the circomference is the given answer of the two suface areas of your cylinder.

For more information you can clink on this link

https://www.khanacademy.org/math/basic-geo/basic-geo-volume-sa/volume-cones/v/cylinder-volume-and-surface-area

to help more.

hope this helps!

best regards

~Jessica

thanks