Answer:
9m, 12m, and 18m.
Explanation:
L equals length.
Side one is L times 2, or 2L.
Side two is L.
Side 3 is L plus 3.
So you have 4L plus 3 equals 39.
So 39 minus 3 equals 36.
Divide 36 by 4 to get 9 (L).
L equals 9.
L times 2 equals 18.
L plus 3 equals 12.