Answer:
57
Explanation:
Because side BD is similar to side BA
triangle BCD seems to be double the size of triangle BAD
By finding the side lengths of the missing sides BC and CD you can get the perimeter.
Because we know the triangle is double the size you can double the lengths of AD and BD to get 24 and 18, if you add 6,9,24, and 18. You will get 57.