Drag and drop an answer to each box to correctly complete the derivation of a formula for the area of a sector of a circle.

Drag and drop an answer to each box to correctly complete the derivation of a formula for the area of a sector of a circle.

                                                                        Picture shown below 

Thank you in advance for whoever responds, I don't know how to reply to your responses. (I'm still new to this website. If I knew how to respond I would, I'm sorry. But thank you for taking the time to read this and responding. :) I appreciate it.