Question

The length and breadth of a rectangle are (4.2 ± 0.2) cm and (6.5±0.2) cm respectively,

calculate the area of the rectangle with error limits.​

Answer 1

Answer:

area of the rectangle with error limits=(27.30+-0.04)

Step-by-step explanation:

Actual lenght of rectangle: 4.2 cm

Actual breath of rectangle: 6.5 cm

Area of rectangle:

$4.2 \times 6.5 = 27.30$

area of the error limits:

$.2 \times .2 = .04$

Hint:

$area \: of \: the \: rectangle = length \times breath$

Answer 2

Answer:

Step-by-step explanation:

l=4.2+or-0.2

b=6.5+or-0.2

A=4.2X6.5=27.3=27(Rounding off to one  significant figure)

deltaA/A=+or-[deltal/l+deltab/b]

+or-[0.2/4.2+0.2/6.5]=+or-[1/21+2/65]=78/1000

deltaA=78/1000xA

deltaA=78/1000x27=+or-2

Area=(27+or-2)