A lifting crane can move along straight rails that are [[$ 30 $]] m long, and it has a reach of [[$ 20 $]] m. How big is the area reached by the crane? (Answer to the nearest [[$ 10 $]] m [[$ ^ 2 $]].) (Finnish matriculation exam, fall 1989)

Take a picture of your solution and submit it to the submission folder.

Answer: The area the crane can reach is m[[$ ^2 $]].