# The inner diamete

Given, inner diameter of a circular well = 3.5 m i.e. r = 1.75m

Height = 10m

(i) curved surface area = 2πrh

= 2 × 3.14 × 1.75 × 10

= 109.9m2 110cm2

(ii) cost of plastering = 40 × 110

= 4400

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