Question

help me and please solve it​

Answer 1

Step-by-step explanation:

This is your correct answer (20°) .

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Answer 2

Answer:

given

angle ABC - angle ACB = 40°

angle 1 = angle 2

now

angle 2 = angle DBC + angle ACB (angle 2 is exterior angle of ∆ DBC)

(I will not use the word angle now)

DBC = 2 - ACB

DBC = 1 - ACB ( angle 1 = angle 2)

DBC = ABC - DBC - ACB ( 1 = ABC-DBC)

DBC + DBC = ABC - ACB

2*DBC = 40° (ABC - ACB = 40°)

DBC = 20°