Question

The length and Breadth of a rectangle is 7 1/2m and 5 1/4m respectively. Find the perimeter.
Please it's urgent​

Answer 1

Answer:

Step-by-step explanation:

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

.

Answer 2

Answer:

25.5m

Step-by-step explanation:

convert length and breath into into decimal form

L= 7+1/2= 7+.5 = 7.5m

B= 5+1/4=5+.25=5.25m

perimeter= 2(l+b)

=> 2(7.5+2.5)

=> 25.5m