Answer:
Step-by-step explanation:
the triangles are similar because they are proportional. the 3 sides of 2 triangles fall in a particular table.
Pythagoras theorem I guess

= 20 inches
In a rectangle, there are 2 similar length measurements & 2 similar width measurements
18.8333333333is the answer
Your answer is -8. I did it out of order. My apology.