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thus
r = area of triangle /(semi-perimeter of the triangle)

see first of all roughly draw the incircle touching all the sides of the triangle

|dw:1358145014344:dw| is the drawing supposed to be like this?

|dw:1358145137085:dw|

A = sqrt(11(11-5)(11-7)(11-10)
right?

yup

u can correct or check the calcualtion

1.47 cm?

thanks :)

welcome