How to calculate the area of a circle?

[Tom Brinkman]

How do i solve for the area of a circle?

Example:
symbol r("r");
ex e = pow(r,2) * Pi ==  30;
ex solve = lsolve(e,r);

//This example does not work.  An error message
indicating that this is not a linear equation is
returned.  How do I solve for "r" in this case.  

//Could you also show an example of how to solve for a
simple polynomial, such as: 
ex = pow(a,2) + a = 3
How do i solve for "a".

regards,
Tom Brikman



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