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03 Sep 2018, 03:50
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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:
65%
(hard)
Question Stats:
43% (01:32) correct
57%
(01:51)
wrong
based on 30
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Time
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Not Attempted Yet
If angle BDC is approximately 65°, what is the approximate value of x?
A. \(20\)
B. \(30\)
C. \(40\)
D. \(50\)
E. \(60\)
03 Sep 2018, 03:50
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Official Solution:
If angle BDC is approximately 65°, what is the approximate value of x?
A. \(20\)
B. \(30\)
C. \(40\)
D. \(50\)
E. \(60\)
We’ll go for PRECISE because we have all the information we need to solve the question.
Adding AD and DC together, we see that triangle ABC is made up of lines of lengths 3, 4, 5 – a Pythagorean triplet! This means ∠B = 90°. Next, since BC = DC, we know that ∠CDB = ∠BDC = 65°. This makes ∠C = 180 – 65 – 65 = 50°. Now that we have two of the triangle’s angles, we can see that ∠A = 180 – 90 – 50 = 40°.
Answer: C
If angle BDC is approximately 65°, what is the approximate value of x?
A. \(20\)
B. \(30\)
C. \(40\)
D. \(50\)
E. \(60\)
We’ll go for PRECISE because we have all the information we need to solve the question.
Adding AD and DC together, we see that triangle ABC is made up of lines of lengths 3, 4, 5 – a Pythagorean triplet! This means ∠B = 90°. Next, since BC = DC, we know that ∠CDB = ∠BDC = 65°. This makes ∠C = 180 – 65 – 65 = 50°. Now that we have two of the triangle’s angles, we can see that ∠A = 180 – 90 – 50 = 40°.
Answer: C
vb1991
Joined: 18 May 2018
Last visit: 24 Jun 2019
Posts: 15
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Location: India
Concentration: Marketing, Strategy
Schools: DeGroote'21 (A)
GMAT 1: 730 Q49 V40
This is a very poor quality question.
