PLEASE HELP I WILL GIVE 100 points

Using the drawing below to answer the questions that follow

Part A what is the scale factor used when going from the larger rectangle to smaller one?

Part B
What is the length of missing side?

PLEASE HELP

PLEASE HELP I WILL GIVE 100 points Using the drawing below to answer the questions that follow Part A what is the scale factor used when going from the larger r class=