Question

The length of the rectangle is twice its breadth. what is the length if the perimeter is 90cm​

Answer 1

Answer:

Step-by-step explanation:

2(2b+b) = P

2(2b+b) = 90

2b+b = 90/2

2b+b = 45

3b = 45

b = 45/3

B = 15cm

L = 2B

L = 2x15 = 30cm

Answer 2

Question :-

The length of a rectangle is twice its breadth. What is the length if the Perimeter is 90 cm.

Given,

Perimeter of rectangle is 90 cm.

Now,

Let the breadth be '$x$' and the length be '$2x$'

Thus,

$2 (2x+x)=90$

$4x+2x=90$

$6x=90$

$x=90\div6$

$x=15$

Verification,

LHS = $2(2x+x)$

= $2(2$ × $15+15)$

= $2 (30+15)$

= $2$ × $45$

= $90$

RHS = $90$

LHS = RHS hence, verified.

Therefore,

The breadth = $x$ $cm$

= $15$ $cm$

The length = $2x$ $cm$

= $(2$ × $15)$ $cm$

= $30$ $cm$

☆ Hope it Helps ☆