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20% increase in both radius and height of the cylinder increases the total surface area of cylinder by 677.6cm?, If the ratio of radius to height is 1:4, then find the radius of cylinder1)10.5 cm2)3.53)7 cm |
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Answer» Answer: 1232cm2Step-by-step EXPLANATION: hr=31 ∴h=3r Volume of CYLINDER =πr2h 3234=722×r2×3r ∴r3=343 r=7cm ∴ TOTAL SURFACE AREA of cylinder =2πr2+2πrh =2πr(r+h) =2×722×7(7+3×7)(∵h=3r) =2×22×7×4 =1232cm2 |
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