Use the following sites to practice perimeter and area
https://www.sheppardsoftware.com/mathgames/geometry/shapeshoot/PerimeterShapesShoot.htm
https://toytheater.com/perimeter-climber/
http://www.mathplayground.com/area_perimeter.html
http://www.beaconlearningcenter.com/WebLessons/AdamAnt/page1.htm
http://pbskids.org/cyberchase/games/perimeterarea/perimeterarea.html
http://www.321know.com/geo78_x4.htm