108k views
15 votes
Perimeter

plsss help

Perimeter plsss help-example-1
User M P
by
8.2k points

1 Answer

3 votes

Explanation:

l= 3x+2cm

b=4cm

Perimeter of the rectangle= 68cm

Now, according to the formula, the perimeter of a rectangle= 2(l+b)

Therefore,

2(l+b)=68

2{(3x+2)+(4)}=68

2{3x+2+4}=68

2{3x+6}=68

6x+12=68

6x=68-12

6x=56

x=56/6

x≈9.33

In order to cross-check this answer, we compute in the values so therefore,

3x+2=3(9.33)+2=27.99+2=29.99≈30

Now, substituting this value in the formula we get,

2(30+4)= 68

The reason for cross-checking was to re-assure because of the decimal value of 9.33, that is why I approximated the expression to 30 in order to get the exact value of 68. otherwise using the decimal value of 9.33 computes an answer of 67.98 which off by a difference of 0.2.

User Nagesh
by
8.2k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories