They are not similar, both of the triangles do not add up to the same number.
All you do is multiply 15 and 6 you get 90. then divide 90 by 9 and you get 10.
The answer is 81.1 because since the 9 place value above 5, you round the number in front of it to 1. so the answer is 81.1. I hope that helps.
Answer:
3
Step-by-step explanation:
9= 3*3
42=3*7*2
