The "tail" of low-frequency values points in the negative direction, and toward the hill is positive. The mean is less than the median.

4

(x/360)*2*pi*r

Its digits add to a multiple of 3 and the last two digits are divisible by 4.

|a+b|<=|a|+|b|

Its digits add to a multiple of 3.

sqrt(3)/2

The acute angles are equal and the obtuse angles are equal.

sqrt(3)/2

(l+2s)(w+2s)