Using 1 unit base.
tan70 = 1/a
a = 1/tan70
a = 0.36397023427 units.
tan80 = 1/b
b = 1/tan80
b = 0.17632698071 units.
tan40 = c/a
c = 0.36397023427tan40
c = 0.30540728934 units.
Therefore, the required angle ? is;
Let it be d.
tand = (0.17632698071/0.30540728934)
d = atan(0.17632698071/0.30540728934)
d = 29.99999999959°
d = 30°
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