Find the surface area for the right cylinder

Question

lisa2345 · Answer

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unklerhaukus · Answer

The surface area of a right cylinder is composed of its two circular bases, and the lateral surface area. The lateral surface is a rectangle.

unklerhaukus · Answer

The area of a circle (or radius $r$) is   $\pi r^2$,

The area of a rectangle (of height $h$, and width $w$) is $hw$.

The width of the rectangle, is the circumference of a circle.

The circumference of a circle is $2\pi r$.

unklerhaukus · Answer

Can you find the area of one of the bases first?

lisa2345 · Answer

2*3.14*15^2

unklerhaukus · Answer

There is no `2*`, in the area of a circle

lisa2345 · Answer

the way I was just taught was 2*pi*r^2 + 2*pi*r*h

unklerhaukus · Answer

oh. then you have found the are of both bases at once. 

each of the circular bases has the area πr^2,   and there are two

unklerhaukus · Answer

If you already have

SA = 2*pi*r^2 + 2*pi*r*h

i guess you can just use it.

unklerhaukus · Answer

what do you get for the lateral surface area

 w h = 2πr h = ?

unklerhaukus · Answer

@lisa2345

lisa2345 · Answer

Got the answer thanks

unklerhaukus · Answer

ok