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29 Oct 2019, 01:51
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A
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:
65% (01:39) correct
35%
(02:27)
wrong
based on 60
sessions
History
Date
Time
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Not Attempted Yet
[GMAT math practice question]
The figure shows that \(OA\) is parallel to \(CB\), and the arc length \(AB\) is \(8 cm\), and \(∠AOB\) is \(40^o\). What is the arc length of \(BC\)?
10.29ps.png [ 14.7 KiB | Viewed 1976 times ]
\(A. 20 cm\)
\(B. 22 cm\)
\(C. 24 cm\)
\(D. 26 cm\)
\(E. 28 cm\)
The figure shows that \(OA\) is parallel to \(CB\), and the arc length \(AB\) is \(8 cm\), and \(∠AOB\) is \(40^o\). What is the arc length of \(BC\)?
Attachment:
10.29ps.png [ 14.7 KiB | Viewed 1976 times ]
\(A. 20 cm\)
\(B. 22 cm\)
\(C. 24 cm\)
\(D. 26 cm\)
\(E. 28 cm\)
29 Oct 2019, 05:24
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MathRevolution
Join OC to get a \(\triangle OBC\)....
\(\angle{OBC}\) will be 40...alternate angles OAllBC
\(\angle{OBC}=\)\(\angle{OCB}=40\), so \(\angle{BOC}=180-40-40=100\) .
Since 40 makes an arc of 8...100 will make an arc of \(8*\frac{100}{40}=20\)
A
Attachments
10.29ps.png [ 15.57 KiB | Viewed 1890 times ]
31 Oct 2019, 01:22
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=>
Since \(∠AOB\) and \(∠OBC\) are alternate interior angles, they are equal to each other, and we have \(∠OBC = 40^o\).
10.29PS(A).png [ 15 KiB | Viewed 1759 times ]
\(∠BOA = 100\) and the length of the arc \(BC\) is \(8*(\frac{100}{40}) = 20.\)
Therefore, A is the answer.
Answer: A
Since \(∠AOB\) and \(∠OBC\) are alternate interior angles, they are equal to each other, and we have \(∠OBC = 40^o\).
Attachment:
10.29PS(A).png [ 15 KiB | Viewed 1759 times ]
\(∠BOA = 100\) and the length of the arc \(BC\) is \(8*(\frac{100}{40}) = 20.\)
Therefore, A is the answer.
Answer: A
