(a) The three triangles are \(\triangle \)ABD, \(\triangle \) ABC, \(\triangle \)ADC
(b) The angles are \(\angle BAC, \angle BAD, \angle CAD, \)
\(\angle ADB, \angle ADC, \angle ABC, \angle ACB \)
(c) The line segments are AB, BC, CA , AD, BD and DC
(d) \(\angle \)ABD and \(\angle \)ABC are triangles which have \(\angle \)B as common.