Contact angle is the angle that a drop of liquid makes as it meets the surface or interface of another phase, usually a solid
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Meter is a unit of length. Radian is a unit of angle. They don't relate.
It is the angle between the a tangent to the liquid surface at the interface and the solid surface inside the liquid. For concave surfaces, it is acute .
degree and radian are juest unit measurment of angle
[-sqrt(2), -sqrt(2)]