A triangle has corners at (2 , 5 ), (8 ,2 ), and (4 ,7 ). What is the radius of the triangle's inscribed circle?

1 Answer
Mar 9, 2018

r=1.13

Explanation:

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AB=\sqrt{6²+3²}=\sqrt{45}=3\sqrt5
D (14/5;23/5)
CD=6 \sqrt5 /5
A_{ABC}=9
AB+BC+CD=15.94
s= 7.97
A_{ABC}=r \cdot s
r=1.13