a rectangle is 12 cm long and 9 cm wide. Its perimeter is doubled when each of its sides is increased by a fixed length. what is the length?

length = 12 cm

breadth = 9 cm.

perimeter of rectangle = 2( l+b)

= 2(12+9) = 2(21) = 42cm.

New length = (12+x) cm

New breath = (9+x) cm

2(12+x+9+x) = 42×2

2(21+x) = 84

21+ x = 84/2

21+x = 42

x= 42-21= 21

x= 21.

Therefore, length = (12+x)cm

=( 12+21) cm = 33cm.

Explanation:

Firstly we have written the length and breadth of the rectangle.

And the perimeter of rectangle i.e. 2(l+b)

Then, as it is in question we have doubled the perimeter

And at last, we have got the value of x.

and by putting the value in the new length we will get our answer.

hope you have got your answer dear.

given the lack of choices, i'm gonna wing it and say that pushing your car off a cliff might not be the best idea. your car might sustain damage from the fall and will probably result in the car being too damaged to jump start.

if that's not good enough, avoid filling the car with bees. bees might get agitated when trapped or during the moving process, and might result in death or painful stings that will make jump starting your car very difficult. but in the event that you do choose to fill your car with bees, remember to wear protective gear!