The dimension of the cistern areLength =8mBreadth =6mHeight =2.5mWe know thatCapacity of cistern= Volume of the cisternVolume of cistern =1×b×hBy substituting the values Volume of the cistern =8×6×2.5By multiplicationVolume of the cistern =120 cm3We know that area of iron sheer required is equal to the total surface area of the cisternSo we getTotal surface area =2(lb+bh+lh)Length =25 cmBy substituting the valuesTotal surface area =2(8×6+6× 2.5+2.5× 8)On further calculationTotal surface area =2(48+15+20)So we getTotal surface area =2× 83=166 m2Therefore, the capacity of the cistern is 120 m3 and the area of the iron sheet required to make the cistern is 166m2.