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A(1,2) , B(7,4), C(5,10)' are the vertic...

A(1,2) , B(7,4), C(5,10)' are the vertices of /_\ ABC'. Also 'P, Q',and 'R' are the midpoints of 'AB, BC' and 'AC' respectively.
a) Find the coordinates of 'P, Q' and 'R'.
b) Prove that 'Delta P Q R' is angled.

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