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In serial communications, the DCE device provides the clock signal, which determines at what speed (more precisely: at what bandwidth) two devices will communicate.
If horizontal, a circle. If vertical, a semi-circle.
28 degrees
Arc AB represents 40/240 = 1/6 of the circumference of the circle. As the angle at the centre subtended by the whole circle is 360° then ∠A0B (if the center is O) measures 1/6 x 360 = 60°. Since a central angle has the same number of degrees as the arc it intercepts, the arc ACB (note we can call the arc AB as arc ACB) measures 60°.