Answer:
a = 51°
b = 28°
c = 31°
d = 70°
Explanation:
In order to answer this question, we can use "Inscribed Angle Theorem".
It states that "Inscribed angles that subtend the same or equal arc in a circle are equal".
Using this, we can say that:
a = 51°
b = 28°
c = 31°
d = 70°