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21 Sep 2019, 18:47
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
63% (02:09) correct
37%
(02:04)
wrong
based on 1427
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In the figure above, if the shaded region is rectangular, what is the length of XY ?
(1) The perimeter of the shaded region is 24.
(2) The measure of \(\angle XYZ\) is 45°.
DS05502.01
Attachment:
2019-09-22_0545.png [ 22.76 KiB | Viewed 22471 times ]
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07 Dec 2020, 16:42
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gmatt1476
Target question: What is the length of XY ?
Statement 1: The perimeter of the shaded region is 24
For the statement we need only recognize that there are infinitely many right triangles in which the same rectangle (with area 24) can be inscribed.
Here are two examples:
As you can see, the length of XY varies, which means we can't answer the target question with certainty.
Statement 1 is NOT SUFFICIENT
Statement 2: The measure of \(\angle XYZ\) is 45°
Since we don't know any lengths in the diagram, there are infinitely many sizes of diagrams that meet statement 2.
In all of the above examples, angle XYZ is always 45°, yet the length of XY varies, which means we can't answer the target question with certainty.
Statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
If ∠XYZ = 45°, we can also conclude that ∠YXZ = 45° (since the three angles in any triangle always add to 180 degrees)
So, let's add all of the 45° angles in the diagram.
At the same time let's let B = the length of the rectangle's base, and let H = the length of the rectangle's height
From here, let's focus on the red triangle below.
The red triangle has height H
Since the red triangle is an isosceles triangle, we know that base of the triangle must also be H
This means the length of side XZ = B + H
At this point let's use the information from Statement 1, which tells us that the perimeter of the shaded rectangle is 24
This means we can write B + H + B + H = 24
When we simplify this we get: 2B + 2H = 24
Divide both sides by 2 to get: B + H = 12
This means the length of side XZ = B + H = 12
Also, since triangle XYZ is an isosceles triangle, we know that side YZ is also 12
So we have the following:
At this point we can find the length of XY by using Pythagorean theorem or by comparing it to the base 45-45-90 right triangle.
Either way, we'll find that side XY has length 12√2
Since we can answer the target question with certainty, the combined statements are SUFFICIENT
Answer: C
Cheers,
Brent
21 Sep 2019, 23:26
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In the figure above, if the shaded region is rectangular, what is the length of XY?
STATEMENT (1) The perimeter of the shaded region is 24.
--let the length of the rectangle be = l and breadth be = b
from this statement we get l+b = 12
from this, we cant find length of YZ and XZ
hence we can't find the value of XY
INSUFFICIENT
STATEMENT (2) The measure of ∠XYZ is 45°
from this, we know the triangle is isosceles but still, we don't know anything about sides.
we cant find the value of XY
INSUFFICIENT
combining both statements
we know the triangle is isosceles and l+b = 12
from this, we can find the value of YZ and XZ
and hence we can find value of XY
SUFFICIENT
C is the correct answer
STATEMENT (1) The perimeter of the shaded region is 24.
--let the length of the rectangle be = l and breadth be = b
from this statement we get l+b = 12
from this, we cant find length of YZ and XZ
hence we can't find the value of XY
INSUFFICIENT
STATEMENT (2) The measure of ∠XYZ is 45°
from this, we know the triangle is isosceles but still, we don't know anything about sides.
we cant find the value of XY
INSUFFICIENT
combining both statements
we know the triangle is isosceles and l+b = 12
from this, we can find the value of YZ and XZ
and hence we can find value of XY
SUFFICIENT
C is the correct answer
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