Ok so the question at hand is....

A) Let A[sub-n] be the area of a polygon with 'n' equal sides inscribed in a circle with radius 'r'. By dividing the polygon into 'n' congruent triangles with central angle 2[pi]/n, show that A[sub-n]=1/2[nr<squared>][sin(2[pi]/n).

B) Show that limit as n goes to infinity of A[sub-n]=[pi]r<squared>.

Sorry if my notation is confusing...if you have any questions just let me know....