# Civil Engineering - Surveying - Discussion

### Discussion :: Surveying - Section 1 (Q.No.48)

48.

ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is

 [A]. 90° [B]. 120° [C]. 210° [D]. 270°

Explanation:

No answer description available for this question.

 Hitesh Kumar said: (Jan 17, 2014) Bearing of CD = 180+30 = 210.

 Debashis Mahato said: (Nov 28, 2014) How its possible?

 Mohammed Libinshad. K said: (Apr 5, 2015) Since it is a regular pentagon. i.e. Bearing of AB = Bearing of DC. => Bearing of CD = Back bearing of DC. = Back bearing of AB = 180+30 = 210.

 Raj said: (Jun 27, 2015) Back Bearing-Fore Bearing = 180. So BB-30 = 180, Now, BB = 180+30 = 210.

 Mohan Cenation said: (Sep 19, 2015) The bearing of AB is 30*. Since, it is less than 90*. So, we have to add 180* for it. Then it is (30*+180*=210*).

 Darshan H A said: (Dec 29, 2015) Total interior angle = (2n-4)*90 where n=4, no of sides. There fore total interior angle = ((2*4)-4)*90 = 360. Each included angle = total interior angle/n = 360/4 =90. The defection angle = 180-each included angle = 180-90 = 90. Then fore bearing of any line = Deflection angle + Fore bearing of previous line. Fore bearing of AB = 30, fore bearing of BC = 90+30 = 120, fore bearing of CD = 90+120 = 210, fore bearing of DA = 90+210 = 300.

 Manatosh said: (Mar 15, 2016) FB of line CD = BB of line AB. = FB of AB + 180°. = 30°+180° = 210°.

 Nikhil said: (Jan 11, 2017) Thanks for the brief description @Darshan H A.

 Shree G said: (Feb 13, 2017) Thanks for the brief description.

 Hitesh Singh said: (Jun 13, 2017) Here, 180 + 30 = 210.

 Sandip Mondal said: (Aug 1, 2017)

 Chandan Kumar Singh said: (Sep 14, 2017) ANSWER-- C Bearing of AB =Bearing of DC BECAUSE regular parallelogram. Bearing of DC = 30 DEGREE. NOW bearing of CD = BB of DC =180+30=210 DEGREE.

 Kuldeep Nautiyal said: (Nov 11, 2017) Bearing of BC = bearing of BA + angle B. B of BC = 30+180+120. Bearing of CD = bearing of CB + angle C. Bearing of CD = (330 - 180) + 60. Angle B + angle A = 180 (sum of consecutive angle of a parallelogram are 180).

 Bhawna said: (Dec 29, 2018) Can anyone explain this with the help of pictorial representation?

 Prepared said: (Jan 6, 2019) 210°-180°=30°+30°=60°. So 210° is the right answer.

 Tushar Methiya said: (Sep 8, 2019) Bearing of AB is 30 & BAD is 60 then for CD angle is 180+30 = 210.