If I have a triangle and they are asking me to find the perimeter of DEF when EF is 16cm and DE is 12cm would I add those two numbers then subtract 180 from that answer?

You haven't given all of the INFO.

To find the perimeter of a triangle, you need to add the lengths of all three sides. In this case, you are given that EF is 16 cm and DE is 12 cm. However, subtracting 180 from the sum of these two numbers is not necessary to find the perimeter.

To find the perimeter, you simply add the lengths of all three sides. In this case, you need to add EF (16 cm), DE (12 cm), and the third side, DF (which is not given in your question).

So, to find the perimeter of triangle DEF, you need to know the length of DF. Once you have that, you can add EF, DE, and DF to get the perimeter.

It's important to note that subtracting 180 is not a step involved in finding the perimeter of a triangle. The value 180 is related to the sum of angles in a triangle, not the perimeter.