Mathematics

Problem

In a circle with centre

O

AB

is a diameter. Moving along the circumference from

A

B

, the distinct points

C

and

D

lie in that order on the circle. Given

\angle CAB = 38^\circ

and

\angle CBD = 25^\circ

, find the measure of

\angle AOD

. a)

126^{\circ}

154^{\circ}

104^{\circ}

180^{\circ}