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605-655 (Medium)|   Geometry|      
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Bunuel
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Is ABC a right triangle? AB = 5; AC = 4. (1) BC = 3 (2) AC = CD 05 Nov 2017, 02:02
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

45% (medium)

Question Stats:

57% (01:25) correct 43% (01:29) wrong based on 113 sessions

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Is ABC a right triangle? AB = 5; AC = 4.

(1) BC = 3
(2) AC = CD

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2017-11-05_1301.png
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A
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
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Is ABC a right triangle? AB = 5; AC = 4. (1) BC = 3 (2) AC = CD 05 Nov 2017, 02:21
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S1: since BC =3, the sides are 3,4,5 which is pythagoras triplet. Hence yes it is right angle triangle. Sufficient
S2 : AC = CD. But it gives no information regarding the triangle ABC, hence it is not sufficient.

Answer is A

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Is ABC a right triangle? AB = 5; AC = 4. (1) BC = 3 (2) AC = CD 06 Nov 2017, 10:25
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Bunuel

Is ABC a right triangle? AB = 5; AC = 4.

(1) BC = 3
(2) AC = CD

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STATEMENT 1 SATISFY THE PYTHAGORAS THEOREM, SO STATEMENT IS SUFFICIENT.
STATEMENT 2 IS INSUFFICIENT, IT DOES NOT PROVE THAT ABC IS AN RIGHT ANGLE TRIANGLE.
ANSWER IS OPTION A
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Is ABC a right triangle? AB = 5; AC = 4. (1) BC = 3 (2) AC = CD 11 Nov 2017, 08:31
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A because I is sufficient, II does not provide any info about ABC
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Is ABC a right triangle? AB = 5; AC = 4. (1) BC = 3 (2) AC = CD 11 Nov 2017, 11:12
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A is the answer.
3,4,5 is a pythagorean triplet. Statement 1 is sufficient

Statement 2 doesnt mention the lenghts.
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Is ABC a right triangle? AB = 5; AC = 4. (1) BC = 3 (2) AC = CD 27 Nov 2017, 23:47
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Question has already been answered as A. Though I want to add one thing, which might be useful to someone who doesnt know. In the case we were given that BD=AB (i.e., the bigger triangle ABD is isosceles), then the second statement would have also sufficed on its own to answer this question.

Thats because second statement states that BC is a median (AC=CD), and in an isosceles triangle, median drawn from the vertex of intersection of equal sides (or you can say median from vertex to the non-equal side) acts as a perpendicular bisector also, and divides the bigger isosceles triangle into two congruent right angle triangles.
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Is ABC a right triangle? AB = 5; AC = 4. (1) BC = 3 (2) AC = CD 01 Jan 2022, 07:05
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