Hi i'm hana in gr4 can you remember me pleas what is perimeter

Hi Hana! :)

I know how you feel, even I forget stuff sometimes. 

Well, perimeter is basically, the distance around a 2-D shape.

Hope this helped! :)

Distance around a figure;The perimeter of  a polygon is the sum of lengths of all the sides.
  
      Or

Say this :The perimeter of a polygon is the distance around the outside of the polygon. A polygon is 2-dimensional; however, perimeter is 1-dimensional and is measured in linear units. To help us make this distinction, look at our picture of a rectangular backyard. The yard is 2-dimensional: it has a length and a width. The amount of fence needed to enclose the backyard (perimeter) is 1-dimensional. The perimeter of this yard is the distance around the outside of the yard, indicated by the red arrow; It is measured in linear units such as feet or meters.