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Step-by-step explanation:

Given the midpoint to be (19.5, 9.5) with one ens point S as (20, 15), to get the coordinate of the other end point, we need to use the formula for calculating the midpoint of two coordinates.

for x coordinate;

X =

for y coordinate;

Y =

where (X, Y) is the midpoint

Given = 20, and = 15, we are to get the coordinate (, )

(X, Y) =

(19.5, 9.5) =

comparing the coordinates;

The coordinate R will be (19, 4)