Question

a tube light is 100cm long and has a diameter of 3cm find the surface area of the tube light​

Answer 1

A tubelight is cylindrical in shape,

Then the lateral surface area of the tube light must be,
$2\pi \: rh$
Where r is the radius and h is the height,

so the surface area required here will be
$2\pi( \frac{3}{2} )(100) \: \: {m}^{2} \\ = 300(3.14) \: {m}^{2} \\ = 942 \: {m}^{2}$

Answer 2

Tubelight is in cylinder shape

Surface area of cylinder=2Πrh+2Πr^2

diameter=3cm....given

radius=1.5cm

height=100cm....given

substituting the value

2×22/7×1.5×100+2×22/7×1.5×1.5

Therefore surface area=957

Hope it helps u