Respuesta :

ipgill1631

Answer:

let breadth be 'b' and then, length would be '4+b'

Step-by-step explanation:

perimeter= 2[l+b]

a/q

40= 2[4+b+b]

40= 2[4+2b]

20=4+2b

2b=20-4

2b=16

b=8

.:l=4+b=4+8=12

.: dimensions of house are: 12*8

aamaruf

Answer:

8m, 12m , area of the house is 32m²

Step-by-step explanation:

P=2l+2w

We are given,  

P=40cm

l=w+4

Plug these into the first formula and solve for the dimensions,

length and width, of the rectangle:

 

40=2(w+4)+2w              Simplify

40=2w+8+2w

40=4w+8

32=4w

8=w OR the width is 8m,  

therefore,  

the length is

l=w+4

l=8+4 m

l=12m

area of the house is =  (8 . 4)m² =32m²

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