Question

In triangle abc BC is produced to D Angle B equal to 50 degree angle ACD equal to 105 degree find Angle BAC

Answer 1

Answer:Analyse the following observation (v) object distance (u) image distance find without calculation 1=(v)+25, (u) -100/ 2= (v)-60 and (u)-40 now find the focal length without calculation and also give reason how you find

Step-by-step explanation:

Answer 2

Answer:

Angle BAC = 55°

Step-by-step explanation:

( TRI - TRIANGLE , ANG - ANGLE )

IN TRI. ABC ,

ANG.ACB + ANG.ACD = 180° .....LINEAR PAIR

ANG.ACB = 75°

BY ANGLE SUM PROPERTY ,

ANG.ACB + ANG.BAC + ANG.ABC = 180°

ANG.BAC = 55°

HENCE SOLVED!!