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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)

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°