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kanest
The perimeter of a triangle is found by adding all of the sides' lengths together.

We know all 3 sides' lengths, so add them together:

[tex]8.89 + 6.6 + 3.581 = 19.071[/tex]

The perimeter of this triangle is 19.071 mm.
1rstar
Hey there !

Perimeter of a triangle is given by sum of length of all it's sides ,

[tex]PERIMETER = 8.89 + 6.6 + 3.581 \\ \\ PERIMETER = 19.071 \: \: mm[/tex]

Hope it helps you :)