Answer :

163º

1) Since the sum of interior angles of a pentagon can be found by using this formula:

[tex]\begin{gathered} S_i=180(5-2) \\ S_i=180(3) \\ S_i=540^{\circ} \end{gathered}[/tex]

2) Then we can write out the following equation for the missing angle:

68º +x +85º +103º +121º = 540º

x+377º= 540º

x= 540º-377º

x= 163º

3) Hence, the answer is 163º

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