Webwork Question

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Hello,
I keep getting .** for this problem but it's coming back as wrong.
Please Help,
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A rectangular box has length 11 inches, width 6 inches, and a height of 10 inches. Find the angle between the diagonal of of the box and the diagonal of its base. The angle should be measured in radians.
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It looks like you have approximately the right answer. Try entering the answer as "0.***", i.e. a zero before the decimal point and three digits after the decimal point..