Question

ABCD is a rhombus if ∠ACB=40° Find ∠ADB

Answer 1

i am not sure if this is the answer but take a look

if angle ACB is 40 degree

then the half of 40 is 20

so maybe angle ADB is equal to 20  

Answer 2

angleADB is 80 and if my ANSWER is correct then ì solve the whole question