Question

the inner diameter of circular well is 3.5 Mts.it is 10 Mts.deep its inner curved surface area in metre square is
A.120 B.110 C.130 D.140

Answer 1

csa of well =2πrh
=2×22/7×3.5/2×10
=44×5/2=220/2
=110 m²