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13 Feb 2021, 09:21
Kudos
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
84% (00:29) correct
16%
(00:35)
wrong
based on 83
sessions
History
Date
Time
Result
Not Attempted Yet
What is the perimeter of triangle ABC?
(1) Side AB measures 5 meters.
(2) Side AC measures 12 meters.
(1) Side AB measures 5 meters.
(2) Side AC measures 12 meters.
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
14 Feb 2021, 01:56
Kudos
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Bunuel
Question: Perimeter = Sum of three sides = ?
Statement 1: AB = 5
NOT SUFFICIENT
Statement 2: AC = 12
NOT SUFFICIENT
COmbining the statements
BC is still unknown hence
NOT SUFFICIENT
Answer: Option E
22 Feb 2021, 07:15
Kudos
Bookmarks
Bunuel
VERITAS PREP OFFICIAL SOLUTION:
And it’s common (in fact a similar problem shows that about 55% of people make this exact mistake) to think “oh well this is a 5-12-13, so both statements together prove that side BC is 13 and I can calculate that the perimeter is 30 meters.” But wait – 5 and 12 only lead to a third side of 13 when you know that 5 and 12 are the short sides. If you don’t know that, the triangle could fit the Pythagorean Theorem with 12 as the hypotenuse, meaning that you’re solving for side b:
5^2 + b^2 = 12^2, so 25 + b^2 = 144, and b then equals the square root of 119.
So while it’s critical that you memorize these four right triangle ratios, it’s just as important that you don’t fall so in love with them that you use them even when they don’t apply.
