Inscribed circle DS

Expert replies

tonebeeze: Master | Next Rank: 500 Posts; Posts: 158; Joined: Mon Nov 02, 2009 5:49 pmFollowed by: 3 members; Thanked: 2 times

by tonebeeze » Sun May 08, 2011 10:41 am

I had a difficult time mapping and visualizing this problem.

If quadrilateral ABCD is inscribed into a circle, what is the value of angle BAD?

1. AC = CD
2. ADC = 70

OA = E

Our collective understanding of the GMAT grows through research, contribution, and teamwork. If you found a problem or comment challenging, helpful, or encouraging, please consider hitting the THANKS button!

Like this post

Source: Beat The GMAT — Data Sufficiency | Sun May 08, 2011 10:41 am

sourabh33: Master | Next Rank: 500 Posts; Posts: 135; Joined: Tue Mar 22, 2011 12:01 pmFollowed by: 3 members; Thanked: 21 times; GMAT Score:720

by sourabh33 » Sun May 08, 2011 5:55 pm

IMO E

Statement 1 - Insufficient
AC = CD

In the attached image we can see that even if AC = CD angle BAD can have more than one solution

Statement 2 - Insufficient
ADC = 70

In the attached image we can see that even if ADC is constant or 70, angle BAD can have more than one solution

Taking 1 & 2 together, BAD can still have multiple values

Like this post

abhi0697: Senior | Next Rank: 100 Posts; Posts: 57; Joined: Tue Apr 19, 2011 7:39 pmFollowed by: 2 members; Location: Singapore; Thanked: 6 times

by abhi0697 » Sun May 08, 2011 6:17 pm

By initial analysis, we know that both (1) and (2) are alone Insufficient to solve for the value of <BAD. As you can see from the below figure:

Now we combine both (1) and (2), and see that now also, we cannot get the value of angle BAD.

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review