In a ∆ ABC, BC is extended upto D : \angleB=1/2 \angleA.\angleA Then \sqrt34 is

RRB Junior Engineer Stage 1 Model Papers 6

Question : 13 of 99

Marks: +1, -0

In a ∆ ABC, BC is extended upto D :

∠B=1/2 ∠A.∠A

Then

√34

Solution:

∠A + ∠B = ∠ACD

∠A+1/2∠A=120°

{3∠A}/2=120

∠A=80°

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