Put everything on the same side of the equals sign and set it equal to zero so you can factor it. 
. In order to factor that you have no choice really but to put it into the quadratic formula. When you do that you find that your zeros are x = 9.623475383 and -.623475383
How are the area formulas for triangles, parallelograms, and trapezoids related to the area of a rectangle?
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To solve for r, you just need to isolate r. To do that, divide by h and π on both sides:
Then, square root both sides to get rid of the 'squared':
Or, if you wanted the answer in terms of π, then just don't divide by it, just divide by h and then square root it.
Then, square root both sides to get rid of the 'squared':
Or, if you wanted the answer in terms of π, then just don't divide by it, just divide by h and then square root it.