A rectangle with sides of lengths 4/5 foot and 1/2 foot?

Has a perimeter of 2.6ft

Has an area of 0.4ft^2

Has a diagonal length of 0.94ft

Take whatever you need from that I guess

For area you would have to do 4/5 times 1/2 which would equal 2/5.

For perimeter, you would do first 4/5 times 2 which is 1 3/5. Then 1/2 times 2 which is 1. Then you add the outcomes (1 3/5 plus 1) which would equal 2 3/5