find the total surface area of hollow cylinder with height 10cm and radii 3cm and 4cm
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Answer:
484 cm²
Step-by-step explanation:
As per given picture External radius = R = 4 cm
Internal radius =r = 3 cm
Height = 10 cm
Total surface area =2πRh + 2πrh + 2π(R² −r² )
= 2π [ Rh + rh + ((R² −r² )]
= 2 x 22/7 [ (4*10) + (3*10) + (4² - 3²)]
= 44/7 [ 40 + 30 + 16 - 9 ]
= 44/7 (86 - 9)
=
= 44 x 11
= 484 cm²
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