Answer:
Explanation:
Considering the inscribed angle theorem which explain that when an angle let say angle θ is inscribed in to a complete circle,then the angle is half of the central angle of the same circle, since the total angle of a circle is 360 degrees while a semi circle is180 degrees.
If the circle is not a full circle but a semi circle then the angle inscribed will be half of 180 , then 90 degrees at right angle.