By definition, the apothem of a pentagon is given by the following mathematical formula: ap = ((L) / (1.45)) Where ap: apotema L = side. The length of a side of the pentagon is L = (ap) * (1.45) Substituting L = (7.43) * (1.45) = 10.77 cm The radius of the circumscribed circle can be found by the Pythagorean theorem in the following way: r = root ((L / 2) ^ 2 + (ap) ^ 2) substituting r = root ((10.77 / 2) ^ 2 + (7.43) ^ 2) = 9.17 cm
