A nonagon has 9 equal sides, so if the length of one of them is 21, then all of them must be too. The perimeter is 189
3 pets probability of cat over dog................ 2:3
We know that AD is the same length as DC, so therefore we can say:
y+6=2y
Move y over to the right side of the equation
6=y
Since DC is equal to 2y, DC would equal 6x2=12
Answer= 150in
9*6=54
54+54=108
6*7=42
108+42=150