It is required to make a closed cylindrical tank of height 1 m and base radius 70 cm from a metal sheet. How many square metres of the sheet are required for the same?
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Answer:
7.48m²
Step-by-step explanation:
required area of the sheet = total surface area of the cylinder
height =1 m = 100 cm
radius =70cm
required area of the sheet = total surface area of the cylinder= lateral surface area+ area of the flat surfaces
required area of the sheet = 2πrh+ 2πr²
required area of the sheet =2πr(h+r) [by factorising]
required area of the sheet =2×(22/7)×70(100+70) cm²
required area of the sheet =440(170)cm²
required area of the sheet =74800cm² or (74800/10000)m² =7.48 m²
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