Unfortunately both this and Alpha are trivial to confuse:

  What is the area of a circle with radius "2x"

yields 3.1415926535897931 * 2x^2 which is obviously incorrect. Alpha on the other hand doesn't give a result unless simplified to

  area of a circle with radius (2x)

where it gives a nonsensical display alongside the fact that 4pi is about 12.5664.

It may give you the wrong answer, but it makes it hard to be led astray:

  Evaluated area = pi * radius^2  giving AREA = 3.1415926535897931 * 2x^2

That description makes it obvious that a pair of parentheses are the only thing lacking.