Question

in a ∆ABC side BC is produce to D if ABC= 40° and ACD =120° find A​

Answer 1

Answer:

A=20°

Step-by-step explanation:

We know that,

angle of angles of a triangle is 180°

ABC+ACD+A= 180°

40°+120°+A=180°

160+A=180°

A=180-160

A=20°

I think it will help you

Answer 2

Answer:

20°

Step-by-step explanation:

as angle sum property states

sum of all the 3 angles of triangle = 180°

therefore

ABC+ACD+A= 180°

=}40°+120°+A=180°

=}160+A=180°

=}A=180-160

=}A=20°

hope it helped

have a good day