(((2 x 11) - 4) x 90)/11
= ( 18 x 90)/11 = 147.27o
(The total of the interior angles of an n-sided polygon is (2n - 4) right angles or 180n - 360 degrees)
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Each interior angle measures 160 degrees
Use a protractor
it's 90 degrees
It is 90 degrees or pi/2 radians.
Interior angle + Exterior angle = 180 So Interior angle = 180 - Exterior angle Interior angle = 4*Exterior angle + 30 Substitute for Interior angle: 180 - Exterior angle = 4*Exterior angle + 30 Collect like terms: 150 = 5*Exterior angle Divide by 5: Exterior angle = 30 deg Therefore number of sides = 360/30 = 12