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If the angle equals 50°, then the measurement of the required angle is
.. 180°-(50°/2) = 155°.
If the angle equals 90°, then the measurement of the required angle is
.. 180° -(90°/2) = 135°
If the angle equals 150°, then the measurement of the required angle is
.. 180° -(150°/2) = 105°
