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1) A triangle has vertices P(–1, –5), Q(4, –11), and R(10, –6). Determine what type of...

1) A triangle has vertices P(–1, –5), Q(4, –11), and R(10, –6).
Determine what type of triangle ▵PQR is.
2)A quadrilateral has vertices A(7, –2), B(9, 1), C(12, –1), and D(10, –4).
Show that the diagonals of quadrilateral ABCD are perpendicular to each other.
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