Question 3

A point lying in the plane of a triangle is equidistant from its sides as well as its vertices then the triangle is

Solution

A point equidistant from the sides is the incentre, and a point equidistant from the vertices is the circumcentre. If they coincide, each angle bisector is also a perpendicular bisector of the opposite side, which makes all sides equal. So the triangle is equilateral.

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