What is the radius of the circle inscribed in triangle ABC if AB=22, AC=12, and BC=13? Express your answer in simplest radical form.
What is the radius of the circle inscribed in triangle ABC if AB=22, AC=12, and BC=13? Express your answer in the simplest radical form.
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1/ Find semiperimeter s = (a + b +c) / 2
2/ Find the area of ΔABC A = sqrt[ s(s - a)(s - b)(s - c)]
3/ Calculate the radius r = A / s 
