Question

Andrew is writing a coordinate proof to show that the triangle formed by connecting the midpoints of the sides of an isosceles triangle is itself an isosceles triangle. He starts by assigning coordinates as given.

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Answer 1

P is the midpoint of DE. Therefore, the coordinates of P are (___, b)
Q is the midpoint of DF. Therefore, the coordinates of Q are (3a, ___)
R is the midpoint of EF. Therefore, the coordinates of R are (___,___)

Answer 2

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