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Find the measure of the missing angle.  Round to the nearest tenth.

 

A regular heptagon

 

 Mar 12, 2021
 #1
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Interior angles of an  n -polygon    sum   to ( n-2)(180)     for 7 angles    5(180 ) = 900 degrees  

     so each of the seven interior angles  = 900 / 7 = 128.57 degrees

 

angle n in the diagram is supplementary to this interior angle and equals  180 - 128.57 =  51.43  degrees

 Mar 12, 2021

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