Answer
$$3\pi - 2,2\pi - 1,\pi ,1, - \pi + 2$$
Work Step by Step
$$\eqalign{
& {\text{arithmetic;}}\,\,\,{a_3} = \pi ,\,\,{a_4} = 1 \cr
& {\text{Calculate }}d \cr
& d = {a_{n + 1}} - {a_n} \cr
& d = {a_4} - {a_3} \cr
& d = 1 - \pi \cr
& \cr
& {\text{The }}n{\text{th Term of an Arithmetic Sequence is}} \cr
& {a_n} = {a_1} + \left( {n - 1} \right)d \cr
& {a_n} = {a_1} + \left( {n - 1} \right)\left( {1 - \pi } \right) \cr
& {\text{Let }}n = 3 \cr
& {a_3} = {a_1} + \left( {3 - 1} \right)\left( {1 - \pi } \right) \cr
& \pi = {a_1} + 2\left( {1 - \pi } \right) \cr
& \pi = {a_1} + 2 - 2\pi \cr
& {a_1} = 3\pi - 2 \cr
& \cr
& {\text{Then,}} \cr
& {a_n} = 3\pi - 2 + \left( {n - 1} \right)\left( {1 - \pi } \right) \cr
& \cr
& {\text{Find }}{a_2},\,\,{a_5} \cr
& {a_2} = 3\pi - 2 + \left( {2 - 1} \right)\left( {1 - \pi } \right) = 2\pi - 1 \cr
& {a_5} = 3\pi - 2 + \left( {5 - 1} \right)\left( {1 - \pi } \right) = - \pi + 2 \cr
& \cr
& {\text{The terms are:}} \cr
& 3\pi - 2,2\pi - 1,\pi ,1, - \pi + 2 \cr} $$
