a = e ... a is the vertically opposite angle of e
Thus we need either of the two to find the answer.
St1:
b + c = 287
b + f = 180 & g + c = 180 ... Supplementary angles
Thus adding the above two: b + f + g + c = 360
But b + c = 287 thus g + c can be found out.
Now in the triangle g + c + e = 180
Thus we can find e. Sufficient.
St2:
by this statement we cannot find either of the two (e or a)
Insufficient.
Answer A
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Geometry
Source: Beat The GMAT — Problem Solving |
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To evaluate each statement, test TWO combinations of angle measurementssukhman wrote:
What is the degree measure of angle a?
(1) b + c = 287 degrees (2) d + e = 269 degrees[/img]
Be sure to satisfy the following constraints:
Angles that form a straight line must add up to 180.
The interior angles of the triangle must add up to 180.
Statement 1: b+c = 287
Case 1:
Here, a = 107.
Case 2:
Here, a = 107.
Since the value of a is the same in each case, SUFFICIENT.
Statement 2: d+e = 269
Case 3:
Here, a = 119.
Case 4:
Here, a = 109.
Since the value of a is NOT the same in each case, INSUFFICIENT.
The correct answer is A.
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Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.
For more information, please email me (Mitch Hunt) at [email protected].
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Brent@GMATPrepNow
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Target question: What is the degree measure of angle a?sukhman wrote:
What is the degree measure of angle a?
(1) b + c = 287 degrees
(2) d + e = 269 degrees
Statement 1: b + c = 287 degrees
b + f = 180 [angles on a line add to 180]
c + g = 180 [angles on a line add to 180]
Add equations to get b + c + f + g = 360
Statement 1 tells us that b + c = 287, so we get: 287 + f + g = 360
So, f + g = 73
f + g + e = 180 [angles in triangle add to 180]
So, 73 + e = 180, which means e = 107, which means angle a must be 107 degrees
Since we can answer the target question with certainty, statement 1 is SUFFICIENT
Statement 2: d + e = 269 degrees
There are several triangles that satisfy this condition. Here are two:
Case a:
Brent
Here, angle a = 60 degrees
Case b:
Here, angle a = 70 degrees
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT
Answer = A
Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
