This problem concerns three circles of equal radius r that intersect in a single point O. (See Figure 1.50.)
(a) Let W1, W2, and W3 denote the centers of the three circles and let wi = for i = 1, 2, 3. Similarly, let A, B, and C denote the remaining intersection points of the circles and set a = By numbering the centers of the circles appropriately, write a, b, and c in terms of w1, w2, and w3.
(b) Show that A, B, and C lie on a circle of the same radius r as the three given circles. (Hint: The center of the circle is at the point P, where
(c) Show that O is the orthocenter of triangle ABC. (The orthocenter of a triangle is the common intersection point of the altitudes perpendicular to the edges.)
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