Question

if the diameter of a right circular cylinder is 10 cm and height is 4 cm then its total surface area is option a 45 CM square b 65 b square c 95 CM square d 125 CM square
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Answer 1

Given :

Diameter of the cylinder = d = 10 cm

Radius of the cylinder = r = 5 cm

Height of the cylinder = h = 4 cm

To find : Total Surface Area of right circular cylinder

Solution :

Total Surface Area of the right circular cylinder (TSA)  

                                               = [(2 x pie x radius x height) + 2 x pie x (radius)²]

= 2πrh + 2πr²

= 2πr( h + r).

Putting values in the formula ,

= 2 x 3.14 x 5 x ( 4+5)

 = 282.6 cm²

So, Total Surface Area of right circular cylinder is 282.6 cm².

Given options are wrong . Therefore, correct answer is 282.6 cm².