I don't know how to find the perimeter of a triangle

it is add all the sides together

Step-by-step explanation:

so since you add all of the sides together,you will get the answer. for example, the sides are 3 mm, 1mm, and 17mm.That would be 17 plus 1 and that equals 18mm.add 2 and then add 3 to get 21mm. btw yur welcome

I’m pretty sure the * means multiplication. so, if you multiply 5*1, it would equal 5. they are basically are-writing 5x1 as 5*1. so they would be… 5 10152025303540455055