declare and initialize $4$ variables with a type of double that will represent $4$ side lengths of a quadrilateral $($a $4$ sided polygon$).$ Choose appropriate variable names, and choose appropriate initial values for these variables.

b$)$ declare and initialize an additional variable of type double to hold the sum of the $4$ side lengths $($this is the perimeter$).$

c$)$ declare and initialize an additional variable of type double to hold the average of the $4$ side lengths. $($the average is the sum of the side lengths, divided by the number of sides, $4$ in this case$).$

d$)$ write a java statement to print out a message that shows the average side length. $($Do not print just the average, print meaningful text along with the average$).$