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