Question

what is angle A in the triangle ABC?​

Answer 1

Answer:

by angle sum property angle A+B+C=180- eq 1

angle c=40 (vertically opposite angle)

angle b=30 (linear pair)

so from eq 1

we can say that

A+B+C=180

A+30+40=180

A+70=180

A=180-70

A=110