A regular square pyramid has height 12 and slant height 15. If the height of a frustum of this pyramid is 4, find: Surface area of the frustum.

PLEASE HELP!! 20 points

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a

i believe the answer is y=0.25x+-3

answer is b.

15

i got this one as well.