Problem Solving

Hi,

Please let me know how we can solve this problem.

Thanks
Farooq

IMO (A) is the answer

(1) says that BDis also of length 6. Because angle DAB = angle ABD because ( angle DAB + angle ABD + angle ADB = 180 so x + angle ABD + 180 - 2x = 180, so angle ABD = x and the triangle ABD is isosceles). But triangle BCD is isosceles too so BC = BD = 6 and this is suff

(2) insufficient because that structure can be as small as a bacteria when seen under a microscope and as large as the size of our galaxy and beyond if only the angles are known so we can never tell the length of any side

IMO A
same reasoning as above

@Farooq.
You can look into this link for a detail explanation

https://www.beatthegmat.com/gmatprep-pra ... t1615.html

Keep Rocking,
Prasant.