Find \(\angle B\) and \(\angle C\) if \(A\) is the centre of the circle and \(\angle A = 42^\circ\).

Answer:
(a) The measure of \(\angle B\) is
(b) The measure of \(\angle C\) is
Answer variants:
\(59^\circ\)
\(69^\circ\)
\(79^\circ\)
\(99^\circ\)