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1. A circle of radius 3cm is dissected into 12 sectors of 30^o each. Only one of them is bisected. And when they are all arranged together, they form a rectangle. What is the length of this rectangle?
Answer: We have arranged them to form a rectangle, so the height will be the radius, we know that. Now let's find the area of the circle.
 \pi 9=28.274. 
This is also the are of the rectangle. We know that area of a rectangle isA=lb
So let's simplify out.


Let's reverse that last equation.
b= \frac{28.274}{3}

9.424 is pretty much the same as  \pi 3.

So we can conclude the length is 3* \pi

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