Question

38. The slant height of a frustum of a cone is 4 cm
and the perimeters (circumference) of its
circular ends are 18 cm and 6 cm. Find the curved
surface area of the frustum and volume in given
units. Is the value of curved surface area and
volume of given frustum are same ? Justify.​

Answer 1

Answer:

answer=48cmsquare

Step-by-step explanation:

slant height =4cm

perimeter (p)=18cm

small perimete ( p)=6cm

larger periter(p)=2piR

18 =2*22/7*R

R =63/22cm

small (p)=2pi r

6=2*22/7*r

r=21/22cm

CSA of frutum= pi(R+r)R squts

=22/7(63/22+21/22)*4

=22/7*4(63+21/22)

=84*4/7

=48cmsquare