Question: Show that The lines that bisect each angle of a triangle meet in a single point O, and the perpendicular distance r from O to

Show that

A B 아들- + cot- + cot- 2 cot 2 ||

The lines that bisect each angle of a triangle meet in a single point O, and the perpendicular distance r from O to each side of the triangle is the same. The circle with center at O and radius r is called the inscribed circle of the triangle (see the figure).

0. b.

A B - + cot- + cot- 2 cot 2 || 0. b.

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