A cistern 6 m long and 4 m wide contains water to a depth of 1 25 m What is the area of wetted surfa...........

Quantitative Aptitude ( CCS) Mensuration 3D

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A cistern 6 m long and 4 m wide contains water to a depth of 1.25 m. What is the area of wetted surface ?

40 sq m

45 sq m

49 sq m

73 sq m

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Explanation:

Given, l = 6 m, b = 4 m and h = 1.25 m
Area of weted surface = Total surface area of cistern – area of roof of cistern
= 2(lb + bh + hl) – l × b
= 2(6×4 + 4×1.25 + 1.25×6) – 6×4
= 2(24 + 5 + 7.5) – 24
= 2 × 36.5 –24
= 73 – 24 = 49 m²