What is the lateral area of a cone with a radius of 3.5 milliliters and a slant height of 8 millimeters?

##28 pi##
or
approximately 87.9646
By definition the lateral area of a cone is…
##A_l = L * pi * r## where ##L## is the slant height and ##r## is the radius.
So
##A_l = L * pi * r = 8 * pi * 3.5 = 28 *pi##
Which is approximately 87.9646