What is the surface area of the cylinder?

Question

anonymous · Answer

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mathstudent55 · Answer

The surface of a cylinder is made up of three parts.
One part is the lateral surface which is a rectangle with length 2(pi)rh.
The other two parts are identical. They are the circular bases. The area of each one is (pi)r^2.

anonymous · Answer

$\int_0^{15}12\pi$dx

anonymous · Answer

So for this one.. It'd be 252pi^2?

anonymous · Answer

Radius = 6, so 2(6*6 * pi) = 72pi is the total area of the two circular bases, Pi*Diameter* height=12x 15 x pi = 180pi is the area of the lateral surface, the sum of these two= 180pi+72pi=252pi

mathstudent55 · Answer

$d = 12 ~ft$, so $r = 6 ~ft$
$h = 15 ~ft$
$SA = 2 \pi rh + 2\pi r^2$
$= 2 \pi (6 ~ft)(15 ~ft) + 2 \pi (6 ~ft)^2$
$= 180 \pi + 72 \pi $
$= 252 \pi ~ft^2$

mathstudent55 · Answer

@ElaineDunlap
You are correct.