find the value of a in the following figure

Answer:
Step-by-step explanation:
it is an opposite angle, it has the same value of the interior angle.
the sum of the interior angles of a triangle is 180°
180 - 30 - 70 = 80°
Answer:
80°
Step-by-step explanation:
the sum of interior angles of a triangle is equal to 180°
a°=180-30-70=80°