1.

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​

Answer»

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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