Question

answer 7 one plzzz say fast
with explanation and how did the answer came why​

Answer 1

Step-by-step explanation:

given,

perimeter = 48

perimeter of a rectangle =2(l+b)

so,

2(l+b)=48

l+b=24 ...... eq1

also given that,

l=2b

substitute in eq 1

2b + b=24

3b=24

b= 8 cm

as length is twice of breadth

l=2b

l=2(8)

l=16cm

Answer 2

GIVEN:

• Length of rectangle is twice of breadth.
• Perimeter of rectangle is 48cm.

TO FIND:

• Dimensions (length and breadth)

SOLUTION:

Let us first assume breadth be x.

Then according to the question length will be 2x.

First we should know the meaning of perimeter.

PERIMETER=Sum of all sides.

$\sf \bigstar Perimeter \: of \: rectangle = 2(l + b)$

$\large \sf : \implies \: \: 48cm = 2(2x + x)$

$\large \sf : \implies \: \: 48cm = 2(3x)$

$\large\sf : \implies \: \: 48cm = 6x$

$\sf \large : \implies \: \: \frac{48cm}{6} = x$

$\sf \large : \implies \: \: 8cm = x$

$\sf \large✬Breadth \: of \: rectangle=x=8cm$

$\sf \large✬Length \: of \: rectangle=2x=16cm$

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More formulae to know!!

• Area of rectangle=length×breadth
• Area of square= side²
• Perimeter of Square=4×Side