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

Thanks in advance!

AnonymousConfusedGuy
Feb 28, 2018

#1**+1 **

Here's a pic, ACG :

The perpendicular bisectors meet at (7, 3.5)......this is the circle's center

The equation of the circle is

(x - 3.5)^2 + ( y - 7)^2 = 3.5^2

So.....the radius is 3.5

CPhill
Feb 28, 2018

#2**+2 **

Thanks CPhill, unfortunately I can't see your diagram but I think i get the gist!

AnonymousConfusedGuy
Feb 28, 2018