a wooden article was made by scooping out a hemisphere from each end of a circle cylinder as shown in the figure if the height of the cylinder is 20 cm and its base is of diameter 7 cm find the total surface area of the article when it is ready any one is genius here who can solve this
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Step-by-step explanation:
Given data
The height h of cylinder = 20 cm
diameter of its base = 7 cm.
The radius r of its base = 3.5 cm.
Curved surface area of cylinder = 2πrh
= 2 × [22/7] ×3. 5 ×20
= 440 cm²
Now, curved surface area of one hemisphere = 2πr²
= 2 × [22/7] × (3. 5)²
= 77 cm².
Total surface area of the article = Curved surface area of cylinder + 2 [curved surface area of hemisphere]
= 440 +2(77)
= 440 +154
= 594 cm²
∴ Total surface area of the article when it is ready is 594 cm²
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