What is the radius of the circle inscribed in triangle $ABC$ if $AB = 10,$ $AC = 17,$ and $BC = 21$? Express your answer as a decimal to the nearest tenth.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the radius of the circle inscribed in triangle $ABC$ if $AB = 10,$ $AC = 17,$ and $BC = 21$? Express your answer as a decimal to the nearest tenth.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3.5
What is the radius of the circle inscribed in triangle $ABC$ if $AB = 10,$ $AC = 17,$ and $BC = 21$? Express your answer as a decimal to the nearest tenth.
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