Question

find the total surface area of a closed cylindrical drum if its diameter is 50 cm and height is 45 CM​

Answer 1

answer:----------

here we have to find the TSA (total surface area) of a closed cylindrical drum.

given :-

diameter = 50cm

→ it's radius = 50/2 = 25cm

height = 45cm

formula to find the TSA of a cylinder is 2πr(h + r)

therefore it's TSA = 2 × 22/7 × 25(45 + 25)

= 1100/7 × 70

= 1100 × 10

= 11000cm²

hence, it's total surface area is 11000cm².

Answer 2

Answer:

Given, for cylindrical drum:

Diameter (d) = 50 cm

and height (h) = 45 cm

Required to find: Total surface area of the cylindrical drum

We have, diameter (d) = 50 cm

⇒ radius (r) = d/2 = 50/2 = 25 cm

Now,

Total surface area of the cylindrical drum = 2πr (h + r)

= 2 x 3.14 x 25 (45 + 25)

= 2 x 3.14 x 25 x 70

= 10,990 sq.cm

Thus, the total surface area of the cylindrical drum is 10,990 sq.cm.