Given a rectangle with the perimeter of 34in. Its length is 12in. Find its width.
The picture below shows the rectangle with the length of 12in and the width of w.
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:
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.
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:
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:
Therefore, the answer is C. That is all for this perimeter of a rectangle practice question.
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