Well, split into two parts then multiply the sides and then round it to the nearest tenth.
Answer:
The answer is 66 ways .
Step-by-step explanation:
You have to use <u>Combination</u> because it says choosing 10 out of 12 as the position is not important :
12C10 = 66 ways of arrangements
The triangles don't have lines of symmetry because the triangles most likely don't have two equal sides.