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shweta singh

· started a discussion

· 1 Months ago

wrong answer (Question: 336985.0 )

answer is 150?

Question:

In ∆ABC, ∠A = 120º. A point D is inside the triangle such that ∠DBC = 2∠ABD and ∠DCB = 2∠ACD. What is the measure of ∠ BDC?  

  

Options:
A)

135

B)

140

C)

145

D)

150

Solution:

Ans: (b)


sachin wason

· commented

· 1 Months ago

Don't assume angle D as a incenter it is not following the incenter property you will get 150 only in you take it as incenter

black mamba

· commented

· 1 Months ago

correct answer is 140, let angle dba=x, then angle bdc=2x ,, angle dca=y, then angle dcb=2y....120+3x+3y=180, 3(x+y)=60,, x+y=20....therefore angle bdc +2(x+Y)=180=>angle bdc=180-2*20=140

Abhijit maity

· commented

· 1 Months ago

Answer is right

vivek singh

· commented

· 1 Months ago

correct answer will be 150

PRATEEK

· commented

· 1 Months ago

Yet to be approved!
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