Verify, whether D is the mid-point of AG.
AG is the line with the measure of 7-1 = 6 cm
AG = 6cm
AD = 4 – 1 = 3 cm
DG = 4 – 1 = 3 cm
Therefore,
3 + 3 = 6cm
AD + DG = AG
So, from the above figure we can see D is the mid-point of the given line AG.