No they do not unless it is a circle with radius (180/pi) and the angles are measured in degrees, or a circle with radius (1/pi) and the angles are measured in radians.
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Yes as for example in the case of a sector of a circle.
true
½ the sum of the intercepted arcs.
40, 100 and 83, 143.
74, 164 36, 126 18, 108