GMAT Math : Rectangles
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Example Questions
Example Question #11 : Rectangles
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 #1 : 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
Example Question #12 : Rectangles
The area of a rectangle is 85; its length is 
The product of the length and the width of a rectangle is its area, so divide area by length to get width. This is simply 
Example Question #2 : Calculating The Length Of The Side Of A Rectangle
The perimeter of a rectangle is 
Substitute 
Example Question #124 : Geometry
Rectangle A and Rectangle B have the same area. Rectangle A has length 80% that of Rectangle B, and its width is 120 centimeters. What is the width of Rectangle B?
Not enough information is given to answer the question.
Let 
Then the width of Rectangle A is 80% of 
The area shared by the two can be expressed as both 
Example Question #125 : Geometry
Craig is building a fence around his rectangular back yard. He knows that the yard is 
The length is 5 more twice the width. Let y be the length of the yard and w the width.
The perimeter of the yard is 160, so we can write:
The yard is 25 feet wide and 55 feet long.
Example Question #126 : Geometry
A rectangle has an area of 
Using the formula for the area of a rectangle, we can solve for the unknown length. We are given the area and the width, so we can solve for the length as follows:
Example Question #2 : Calculating The Length Of The Side Of A Rectangle
The length of a rectangle is twice its width. If the rectangle's area is 
We're told the length is twice the width so 
Remember, we're being asked for the length, not the width so:
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