Answer:
Distance between point 
 and midpoint of line joining 
 and 
 = 
 units.
Explanation:
Given:
Points:

To find distance from point A to midpoint of BC.
Midpoint M of BC:

 [Plugging in points 
]


Distance between A and M:

 [Plugging in points 
]




Since distance is always positive ∴ 
 units