Calculate the lengths of the sides of the triangle PQR. Use your answers to determine whether or

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Calculate the lengths of the sides of the triangle PQR.

Use your answers to determine whether or not the triangle is right-angled.

a. P(3, 11), Q(5, 7) R(11, 10)

b. P(- 7, 8), Q(-1, 4), R(5, 12)

c. P(- 8, - 3), Q(- 4, 5), R(- 2, - 6)

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