GMAT Math : DSQ: Calculating the length of the side of a rectangle
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Example Questions
Example Question #61 : Quadrilaterals
Ronald is making a bookshelf with a rectangular base that will be two yards tall. What is the area of the base?
I) The distance around the base will be 
II) The smaller sides of the base are half the length of the longer sides.
Statement II is sufficient to answer the question, but Statement I is not sufficient to answer the question.
Either statement alone is sufficient to answer the question.
Both statements together are needed to answer the question.
Neither statement is sufficient to answer the question. More information is needed.
Statement I is sufficient to answer the question, but Statement II is not sufficient to answer the question.
Both statements together are needed to answer the question.
To find the area we need the length and width of the rectangle. We can use II together with I to make an equation for perimeter with only one unknown.
So we need both to solve.
Solve for 
Example Question #103 : Geometry
Find a possible width of rectangle 
I) 
II) 
Statement I is sufficient to answer the question, but statement II is not sufficient to answer the question.
Either statement is sufficient to answer the question.
Both statements are needed to answer the question.
Statement II is sufficient to answer the question, but statement I is not sufficient to answer the question.
Neither statement is sufficient to answer the question. More information is needed.
Both statements are needed to answer the question.
When asked to find the width of a rectangle we will need to use both statemests together.
For Statement I) we can use the perimeter formula.
Now, for Statement II) we will use the length of the diagonal along with the Pythagorean Theorem.
From here you can solve the perimeter equation in terms of either l or w. Then you can use substitution into the Pythagorean Theorem to solve for a possible width.
Example Question #62 : Quadrilaterals
Find the length of the side of a rectangle with a width three times the length.
- The area of the rectangle is
.
- The perimeter of the rectangle is
.
Each statement alone is sufficient to answer the question.
Statement 1 alone is sufficient, but statement 2 alone is not sufficient to answer the question.
Statements 1 and 2 are not sufficient, and additional data is needed to answer the question.
Both statements taken together are sufficient to answer the question, but neither statement alone is sufficient.
Statement 2 alone is sufficient, but statement 1 alone is not sufficient to answer the question.
Each statement alone is sufficient to answer the question.
Statement 1:
Statement 1 is sufficient to answer the question
Statement 2:
Statement 2 is also sufficient to answer the question
Example Question #1 : Rectangles
A rectangle has a width measuring twice the length. Find the length.
- The rectangle has a perimeter of
.
- The rectangle's area is
.
Statements 1 and 2 are not sufficient, and additional data is needed to answer the question.
Statement 2 alone is sufficient, but statement 1 alone is not sufficient to answer the question.
Each statement alone is sufficient to answer the question.
Statement 1 alone is sufficient, but statement 2 alone is not sufficient to answer the question.
Both statements taken together are sufficient to answer the question, but neither statement alone is sufficient.
Each statement alone is sufficient to answer the question.
Statement 1:
Recall the formula to find the perimeter of a rectangle. Substitute in the given information and solve.
Statement 2:
Recall the formula for the area of a rectangle. Substitute in the given information and solve.
Each statement alone is sufficient to answer the question.
Example Question #3 : Rectangles
Given parallelogram 
1)
2)
BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.
Statement 2 ALONE is sufficient to answer the question, but Statement 1 ALONE is NOT sufficient to answer the question.
Statement 1 ALONE is sufficient to answer the question, but Statement 2 ALONE is NOT sufficient to answer the question.
BOTH statements TOGETHER are insufficient to answer the question.
EITHER statement ALONE is sufficient to answer the question.
BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.
The length of one diagonal alone does not prove the parallelogram to be a rectangle, nor do the lengths of the sides.
Suppose we know all of these lengths, though. Since 
The sides 
This is true; 
Therefore, both statements together are sufficient to answer the question, but neither statement alone is sufficient to answer the question.
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