A cistern 6 m long and 4 m wide, contains water up to a

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A cistern 6 m long and 4 m wide, contains water up to a depth of 1 m 25 cm. The total area of the wet surface is

Required total area = Area of four walls + Area of the base
= 2 × 1.25 (6 + 4) + 6 × 4
= 2.5 × 10 + 24 = 49 m².