Question

slant height of frustum of cone =4cm and perimeter of its cir ullar end are 18cm and 6cm find cSA of frustum ​

Answer 1

Answer:

48cm²

Step-by-step explanation:

given= 2πr1 = 18cm                               2πr2= 6cm

r1 = 9/π cm                                                 r2 = 3/π cm

l= 4cm

CURVED SURFACE AREA OF FRUSTUM = π(r1 + r2)l

                                        = π[(3+9)/π]*4

                                        = 12*4= 48cm²

therefor csa=  48cm²