Question

a rectangular strip 25cm*7cm is rotated about the longer side.find the total surface area of the solid thus generated.

Answer 1

the answer may be the area of the soilds this generated is 175

Answer 2

Answer:

The total surface area of the solid thus generated is 1406.72 centimeter square.

Step-by-step explanation:

Given : A rectangular strip of size 25 cm × 7 cm is rotated about the longer side.

To find : The total surface area of the solid thus generated?

Solution :

Rectangular strip has radius, r = 7 cm

Height, h = 25 cm

Total surface of the solid is

$S=2\pi r(r+h)$

$S=2(3.14)(7)(7+25)$

$S=2(3.14)(7)(32)$

$S=1406.72 cm^2$

Therefore, The total surface area of the solid thus generated is 1406.72 centimeter square.