You can put this solution on YOUR website! The simple rule is that there are 2*pi radians in 360 degrees.
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Solve using proportions.
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.4 / 2*pi = x / 360
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Cross multiply.
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.4*360 = 2*pi*x
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Divide both sides by the constant 2*pi.
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x = (.4*360) / 2*pi = 144/(2*pi) = 72/pi = 22.91831180523293
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.4 radians = 22.92 degrees
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To check the answer, you can type "convert .4 radians to degrees" into the Google search engine box.
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Done.