Answer:

- Firstly you need to remember the formula to find out surface area of a cylinder - Surface area of a cylinder = 2πr ( r + h ) where r is the radius of a circular face and h is the height of the cylinder.
- We're provided : Diameter of cylinder = 12 which means radius ( r ) = 6 cm [ Radius is the half of diameter ] & Height ( h ) = 25 cm & we know pi ( π ) = 22/7.


- Plug the values & then simplify !



- Hence , The surface area of given cylinder is 1169.14 cm²
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<span>506,709= 500,000+6,000+700+9
</span>
Answer:
170
Step-by-step explanation:
Let the number of cell phones be x
2 : 3 = 68: x
Product of extremes = product of means
2 * x = 68 * 3
x = 
= 34 * 3
x = 102
Number of phones = 102 + 68 = 170