180 degrees( 12-2)=1800degrees This is the sum of the interior angles. So divide 1800 by 12 and have the measure of each angle.
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It is: 180-vertex angle = exterior angle
Two ray vertex
If that '56' has units of 'degrees', then the vertex angle is 68 degrees.
Since you know one base angle is 54 then the other base angle is also 54 making a total of 108. Since a triangle is 180, your vertex angle is 72.
the measure for a regular rectangle is 69in. by fudge you and measure it yourself.