please help

The total of the interior angles of any polygon is (n – 2) • 180^o where n is the number of sides. 

The total of the interior angles of this (and every) pentagon is 540^o so set up the addition. 

z + 2z + 117 + 64 + (2z –6) = 540 

5z + 175 = 540  

5z = 540 – 175

z = 73^o  

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