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the area (a) of a circle is a function of its radius (r) and is given by the function a = f(r) = πr2. what is the domain of this function?

a: all positive real numbers
b: all real numbers
c: all positive real numbers including 0
d: all real numbers excluding fractions

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In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

What is the value of x in the this question ?