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25 Feb 2020, 03:29
Kudos
Bookmarks
A
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:
94% (00:39) correct
6%
(01:06)
wrong
based on 68
sessions
History
Date
Time
Result
Not Attempted Yet
In triangle ABC, the measure of angle B is 80 as shown in the figure above. What is the measure of angle A?
(1) Side AB and BC are the same length
(2) The length of side AC is 10 inches.
Attachment:
3-09-16 10-12-26 AM.jpg [ 3.86 KiB | Viewed 2854 times ]
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
25 Feb 2020, 06:09
Kudos
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Bunuel
Solution
Step 1: Analyse Question Stem
- • \(∠ABC = 80\)
• \(∠ABC + ∠BAC + ∠BCA = 180\)
• \(∠BAC + ∠BCA = 100\)
Step 2: Analyse Statements Independently (And eliminate options) – AD/BCE
Statement 1: Side \(AB\) and \(BC\) are the same lengths.
- • It means \(ABC\) is an isosceles triangle
- o \(∠BAC = ∠BCA\)
• \(2*∠BAC=100\)
• We can find the value of angle \(A\).
Statement 2: The length of side \(AC\) is \(10\) CM
- • We cannot infer anything about the angle A with this information.
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