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The "tail" of low-frequency values points in the negative direction, and toward the hill is positive. The mean is less than the median.
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4
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(x/360)*2*pi*r
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Its digits add to a multiple of 3 and the last two digits are divisible by 4.
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|a+b|<=|a|+|b|
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Its digits add to a multiple of 3.
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sqrt(3)/2
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The acute angles are equal and the obtuse angles are equal.
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sqrt(3)/2
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(l+2s)(w+2s)