GMAT Math : Calculating the perimeter of a rectangle
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Example Questions
Example Question #1 : Quadrilaterals
A rectangle has a length of 
Example Question #351 : Problem Solving Questions
A farmer decides to build a fence two feet around his rectangular field. The field is 
The fence is 2 feet around the field. Therefore the area actually enclosed by the fence is 4 feet longer and 4 feet wider than the field.
The length of fencing needed is the perimeter of the area enclosed which is calculated as follows:
The fencing should be 90 feet.
Example Question #3 : Calculating The Perimeter Of A Rectangle
If a rectangle has an area of 
To find the perimeter, we need the length and the width. We are only given the length, so first we must find the width using the given area:
The perimeter is simply two times the length plus two times the width, so we can now use the known length and width to calculate the perimeter:
Example Question #4 : Calculating The Perimeter Of A Rectangle
The diagonal 
We can see that the hypotenuse AD of triangle ABD is 15 cm. We should check whether ABD is a Pythagorean Triple, whose sides are in the ratio 
Example Question #1 : Calculating The Perimeter Of A Rectangle
The area of rectangle 
Given the information we are provided, we could set up an quadratic equation, however, this equation would be really complicated to solve, instead we should try to find whether the diagonal of this rectangle can be the hypotenuse of Pythagorean triangle. The hypotenuse AD of triangle ADC, has length 10, therefore if it is a Pythagorean Triple, its other lengths must be 6 and 8, since the sides are in ratio 
Alternatively, we could have found the missing lengths with trial and error, by doing so, we would have picked length for which, the area is 48 and tried to see whether the diagonal would remain 10, until we get the working set 6 and 8.
Example Question #2 : Calculating The Perimeter Of A Rectangle
The width of a rectangle is twice the length. Find an equation representing the perimeter.
The perimeter of a rectangle can be found by adding up all the sides:
We are told the width of the rectangle is twice its length so 
Example Question #2 : Calculating The Perimeter Of A Rectangle
Find the perimeter of a rectangle whose width is 
To solve, simply use the formula for the perimeter of a rectangle:
Example Question #8 : Calculating The Perimeter Of A Rectangle
Note: figure NOT drawn to scale
Give the perimeter of the above rectangle.
The perimeter of a rectangle is the sum of the lengths of its sides. Since a rectangle has two pairs of sides of the same lengths, this will be
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