If the length of a rectangular l = 0.5 cm, breath b = 2.1 cm and minimum possible measurement by scale = 0.1 cm then the area is

Options

A. `22" cm"^(2)`
B. `22.1" cm"^(2)`
C. `22.05" cm"^(2)`
D. `22.2" cm"^(2)`

Answer

A

Explanation

Area of rectangle,
`A=lb=10.5xx2.1=22.05" cm"^(2)`
Minimum possible measurement of scale = 0.1 cm
The product should have significant figures, that are present in a measurement with least number of significant figures.
So, area measured by scale
`=22" cm"^(2)`.