Answer :
Given:
Radius (r) of cylindrical part = 3.5 cm
Radius (r) of hemispherical part = 3.5 cm
Height of cylindrical part (h) = 10 cm
Surface area of article = CSA of cylindrical part + 2 × CSA of hemispherical part
= 2 πrh + 2 × 2 πr2
= (2 π × 3.5 × 10) + (2 × 2 π × 3.5 × 3.5)
= 70 π + 49 π
= 119 π
= 17 × 22
= 374 cm2
Hence, the total surface of the article = 374 cm2
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