Q. 405.0( 3 Votes )

In Δ ABC, <span l A. 80°

B. 20°

C. 40°

D. 30°

Answer :

Given:


In Δ ABC, A = 100°, AD bisects A and AD BC


Formula Used/Theory:-


Pythagoras theorem:-


Base2 + Height2 = Hypotenuse2


When A is bisected


Then;


DAB = 50° and DAC = 50°


Then;


In Δ ABD


As AD BC


ADB = 90°


Sum of all angles is 180°


ADB + DAB + B = 180°


90° + 50° + B = 180°


B = 180° - 140° = 40°

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