WAL how to find the perimeter and area of some classroom objects.

Term 4

OBJECT

PERIMETER

AREA

Formula

P= 2 (L + B) mm,cm,m

A = L x B/W

(sq mm,sq cm,sq m)

Modelling book

L=40cm    B=30cm

P=40+30=70cm

L=40cm    B=30cm

A=40x30=1200cm

A=1200sq cm

Large Rectangular Table

L=121cm    B=81cm

P=121+81=202cm

L=121cm    B=81cm

A=120x80=9600cm

1x1=1cm

9600+1=9601sq cm

Tote tray

L=39cm    B=27cm

P=39+27=66cm

L=39cm    B=27cm

A=30x20=600cm

9x7=63cm

600=63=663sq cm

My reflection

I found this a bit tricky because I was unsure about how it works but now I know how it works.

My next step is to do some harder ones and do it in a quicker time.