NLVM-Geoboard for 6-8 grade to illustrate area, perimeter

I found this manipulative practice is a fun way of learning to illustrate different kind of polygon and measuring their area and perimeter. student can findout one polygon in different size and can measure its area and perimeter and also able to findout the possible maximum area and perimeter. student also can able to findout the relationship between the area of triangle and rectangle. student shouldn't limit their talents they can able to illustrate different kind of open and closed polygon. This lesson will help student to explore their geometric knowledge of polygon by themselves very fun way.