Drawing Arc

Drawing Arc

Hi ,
I want to draw an arc which joins these end points of 2 parallel lines to the same side like

a-
c.
b-
Join a, b with a point inbetween c. Join pointbc,ca ie make an arc .

how can I draw them???
the points are
wx10,wy10
wx11,wy11
wx15,wy15

help!!!!

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