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12 Nov 2017, 10:21
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
57% (02:36) correct
43%
(02:34)
wrong
based on 76
sessions
History
Date
Time
Result
Not Attempted Yet
In the quadrilateral above, if AB = BD = BC, and AD = CD, then x =
(A) 70
(B) 60
(C) 50
(D) 40
(E) 30
Attachment:
2017-11-12_2103.png [ 15.14 KiB | Viewed 4515 times ]
13 Nov 2017, 06:42
Kudos
Bookmarks
Bunuel
No replies, so let me give it a try with a att figure
as C
Attachments
quad1.png [ 13.58 KiB | Viewed 3967 times ]
13 Nov 2017, 07:41
Kudos
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Bunuel
(1) Find angle ABC: if BD = BC, then BDC = BCD = 70 and DBC = 180 - 70(2) = 40. So, ABC = 40*2 = 80.
(2) Find angle ACD: if DA = DC, then ADC = 140 and ACD = (180 - 140) / 2 = 20.
(3) Find x: Triangle BCD or BAD = 180 = 70 + 40 + (x + 20), x = 50.
