Find the area of regular hexagon abcdef with the given consecutive vertices a(-4,2) and b(0,5)

We know that 

[the area of regular hexagon]=(3(√3)/2)*b²
where 
b> is the length side

find the length side b
distance between points A(-4,2) and B(0,5)
d=√[(5-2)²+(0+4)²]> d=√(9+16)> d=5 units

b=5 units
[the area of regular hexagon]=(3(√3)/2)*5²> 64.95 units²