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Find the area of the triangle whose vert...

Find the area of the triangle whose vertices are:
(i) A(3, 8), B(-4, 2) and C(5, -1)
(ii) A(-2, 4), B(2, -6) and C(5, 4)
(iii) A(-8, -2), B(-4, -6) and C(-1, 5)
(iv) P(0, 0), Q(6, 0) and R(4, 3)
(v) P(1, 1), Q(2, 7) and R(10, 8)

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