20% increase in both radius and height of the cylinder increases the total surface area of cylinder by 677.6
cm?, If the ratio of radius to height is 1:4, then find the radius of cylinder
1)10.5 cm
2)3.5
3)7 cm
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1
Answer:
1232cm2
Step-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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