Question

CSA of cylinder is 1980cm^2 Volume of cylinder is 10395cm^3 find TSA of cylinder​

Answer 1

CSA of the cylinder = 2πrh

1980cm² = 2× 22/7×rh

rh. = 1980×7/22 ×1/2

rh. =315 cm²

and now,

volume of the cylinder = πr²h

10395cm³ = 22/7 ×r (rh)

10395×7/22 = r(315) {rh=315}

r. = 10.5 cm

so,

rh = 315

h = 315/ 10.5=30 cm

so,

TSA of the cylinder = 2πr (h+r)

= 2×22/7 ×10.5 (10.5+30)

= 66× 45.5 = 3003cm²

so the total surface area of the cylinder is 3003cm²

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