Question -
Answer -
Length of sheet,┬аl┬а= 4.234 m
Breadth of sheet,┬аb┬а= 1.005 m
Thickness of sheet,┬аh┬а= 2.01 cm = 0.0201 m
The given table lists the respective significant figures:
| Quantity | Number | Significant Figure |
| l | 4.234 | 4 |
| b | 1.005 | 4 |
| h | 0.0201 | 3 |
Hence, area and volume both must have least significant figuresi.e., 3.
Surface area of the sheet = 2 (l┬а├Ч┬аb┬а+┬аb┬а├Ч┬аh┬а+┬аh┬а├Ч┬аl)
= 2(4.234 ├Ч 1.005 + 1.005 ├Ч 0.0201 + 0.0201 ├Ч 4.234)
= 2(4.25517 + 0.0202005 + 0.0851034)
= 2 ├Ч 4.36
= 8.72 m2
Volume of the sheet =┬аl┬а├Ч┬аb┬а├Ч┬аh
= 4.234 ├Ч 1.005 ├Ч 0.0201
= 0.0855 m3
This number has only 3 significant figures i.e., 8, 5, and 5.