Question given below:
Solution 1:
Solution 2:
Solution 3:
Abc equilateral triangle, unique complement is 20 to 40 and get 60, 60, 60 degree triangle, then 20+90 = 180, 110, then 70 is base on BC = BD on C by linear junction of a triangle, 180-70=110 , 110 +c=100 , 110+k=100 , = 1*20º =2*10
Solution 4: