Question

find the total surface area of cylinderical rod whose diameter is 7 cm and length is 21 cm​

Answer 1

Answer:

539 sq. cm

Step-by-step explanation:

diameter = 7cm

radius = 7/2 cm = 3.5cm

height = 21 cm

total surface area of a cylinder is T. S. A. =

$2\pi rh+2\pi r^{2}$

2 x 22/7 x 3.5 x 21 + 2 x 22/7 x 3.5 x 3.5

539 sq. cm