2D Oval Rotation

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Buggy

I am making a simple 2D game. I am trying to create all media in-game. The bullet is composed of two lines and an oval. I need to rotate the bullet 360 degrees (in increments of 10). I successfully was able to rotate the two lines, but not about a central point. My formula:

x# = lastX#*cos(10) - lastY#*sin(10)
y# = lastY#*cos(10) + lastX#*sin(10)

(I'm pretty sure that's the formula.)

As for rotating the oval, I'm stumped, because the oval is always drawn from the top-left-hand corner.

So my questions are:

1) How can I rotate the lines about a central point?
2) How can I rotate the oval about a central point?

I hope this makes sense.

Thanks in advance.