Given the line segment AB = a, extend AB to point C so that BC = 1 / 3AB and point D is the midpoint of line segment AC. (1) find the length of CD. (2) if BD = 2 cm, find the length of ab .______ .___ ._. a d b c

Given the line segment AB = a, extend AB to point C so that BC = 1 / 3AB and point D is the midpoint of line segment AC. (1) find the length of CD. (2) if BD = 2 cm, find the length of ab .______ .___ ._. a d b c

[1]1.5a
[2]12