A lake is 85 feet across diameter scale 1in:4 feet

Pls! does anybody know a shortcut for answering these types of questions in the future?

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²