Aptitude - Volume and Surface Area - Discussion
Discussion Forum : Volume and Surface Area - General Questions (Q.No. 4)
4.
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
Answer: Option
Explanation:
Let the length of the wire be h.
| Radius = | 1 | mm | = | 1 | cm. | Then, |
| 2 | 20 |
 |
22 | x | 1 | x | 1 | x h = 66. |
| 7 | 20 | 20 |
| h = |
 |
66 x 20 x 20 x 7 |  |
= 8400 cm = 84 m. |
| 22 |
Discussion:
35 comments Page 4 of 4.
Surya said:
5 years ago
How 22/7 possible?
Is it pi value?
π = 3. 144 right?
Is it pi value?
π = 3. 144 right?
Anitha said:
5 years ago
@Surya.
22/7 approximately = 3.14.
22/7 approximately = 3.14.
Shuvan.s said:
4 years ago
Why do they take 22/2 * 1/20 * 1/20? Please explain it.
(1)
Akchansh said:
4 years ago
Length of wire should be whole perimeter of cyclinder, why it is calculated same as height?
(2)
Twinkle said:
3 years ago
v.ocyclinder= πr^2h.
Where π equals to 22/7.
22/7*1/20*1/20*h = 66,
11h/1400 = 66,
h = 92400/11,
h = 8400cm,
h = 8400/100m,
h = 84m.
Where π equals to 22/7.
22/7*1/20*1/20*h = 66,
11h/1400 = 66,
h = 92400/11,
h = 8400cm,
h = 8400/100m,
h = 84m.
(2)
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