In the following figure, MN is a tangent to a circle with centre O at point A. If BC is a diameter and ∠ ABC = 42°, then find the measure of ∠ MAB.
Answer & explanation
Correct answer: option 2
According to the concept
∠BAC = 90°
So, ∠BCA = 180° - 42° - 90°
⇒ 48°
Now, according to the concept
∠MAB = ∠BCA
So, ∠MAB = 48°
Therefore, ∠MAB is 48°