Consider the points A(3, 15), B(13, 3), C(7, 5) and D(8, 0). a. Show that ABC is

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Consider the points A(3, 15), B(−13, 3), C(−7, −5) and D(8, 0).

a. Show that ABC is a right-angled triangle.

b. Find the equation of the circumcircle.

c. Hence show that A, B, C and D all lie on the circumference of this circle.

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