Question

the length and breadth of a rectangular field are. 5. and. 4
2 --. --
3 m. 7 m
respectively, find the area of rectangular field​

Answer 1

Answer:

length= 5

breadth= 4

:. area= l x b

= 5 x 4

= 20 m²

Answer 2

Here, l=(5.7±0.1)cm,b=(3.4±0.2)cm

Area, A = l×b=5.7×3.4=19.38cm

2

=19.0cm

2

(rounding off to two significant figures)

∴

A

△A

=±(

l

△l

+

b

△b

)

= ±(

5.7

0.1

+

3.4

0.2

)=±(

5.7×3.4

0.34+1.14

)=±

19.38

1.48

⇒△A=±

19.38

1.48

×A=±

19.38

1.48

×19.38=±1.48

△A=±1.5 (rounding off to two significant figures);

Area = (19.0±1.5)cm

2

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