28. Three equal circles touch one another externally. The centres of three circles form (A) a right-angled triangle (B) an equilateral triangle (C) a isosceles triangle (D) similar triangle are equal then
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the answer is equilateral triangle
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Let the three circles be of equal radii r. Then, the triangle formed by joining the centres of these circles is an equailateral triangle with each side 2r.
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