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Given:
Coordinates of point C are (-3,6).
Point B(0,5.5) is the midpoint of AC.
To find:
The coordinates of A.
Solution:
Let the coordinates of point A are (a,b).
Formula for midpoint:
Using the above formula, the midpoint of A(a,b) and C(-3,6) is
On comparing both sides, we get
and,
Therefore, the coordinates of point A are (3,5).