trignometry

The number of square meters required is actually the curved surface area of the tent

=C.S.A of the frustrum+C.S.A. of the conical part

for the frustrum, R=16, r=10 , h=8 slant height=L=

for the cone, l=12

C.S.A of the frustrum=

C.S.A=of the cone =(radius of base of the tent =r)

add the two and you will get the answer.