Question

The breadth of the rectangle is 'b' cm and the length is twice the breadth added to 4. If the length is 8 cm, then what is the perimeter of the rectangle?

• A. 20

Answer 1

The correct option is A 20
Given,
Breadth of the rectangle = b cm
Length of the rectangle = 4 cm

Now,
$Lengthoftherectangle=Twicethebreadth+4$
$8cm=2b+4$

Now, applying trial and error method to find the breadth.

Value of 'b'	L.H.S	R.H.S
1	8	6
2	8	8

The breadth of the rectnagle = 2 cm

$\therefore$ The perimeter of the rectangle $=2\times (l+b)$
$=2\times (8cm+2cm)$
$=20cm$