a) Work out the size of angle 0.
b) Which of the circle theorems below
allows you to calculate this angle?
C
Not drawn accurately
38°
The angle at the circumference in a semicircle is a right angle
Opposite angles in a cyclic quadrilateral add up to 180°
The angle between the tangent and the radius at a point
on a circle is 90°
Two tangents that meet at a point are the same length
B
The perpendicular line from the centre of a circle to a chord
bisects the chord