Respuesta :

Answer: 20+21+20+21=40+42=82

Step-by-step explanation:

Add up the sides

Multiply by 2

Try:

20+21=41

Multiply by 2:82

Answer:

82 meters

Step-by-step explanation:

to get the perimeter of a rectangle or square you have to add the lengths of all the four sides

P=20+20+21+21

P=2x20+2x21

P=2x(20+21)

P=2x41

P=82