Step 1

The picture below shows the rectangle with the length of 12in and the width of w.

Step 2

Since the value of the perimeter is given as 34in, we can substitute A with 34. Similarly, since the length is given as 12in, we can substitute l with 12. This is shown below:

Step 3

Now, we have  2(12 +w) = 34. To get a step closer in finding w, we need to remove 2. We can do so, by dividing both sides of the equation with 2.

Step 4

Next, we have  12 +w = 17. Notice that, to find w, we need to remove 12. We can do so, by adding -12 to both sides of the equation. This is shown below:

Step 5

Now, the calculated number 5, has no meaning unless we include the unit for it. Since the length of the rectangle is given in inch, w will also be in inch. Hence:

w = 5 in

Step 6

Therefore, the answer is C. That is all for this perimeter of a rectangle practice question.

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