WALT find the Perimeter of 2D shapes
Formulae:
Perimeter of a Square = side + side + side + side or 4 x side
Example: The perimeter of a square of side 5cm = 5 + 5 + 5 + 5 = 20 cm or 4 x 5 = 20 cm
Find the perimeter of the following squares:
The perimeter of a square of side 10cm = 10x4=40 cm
The perimeter of a square of side 25cm = 25x4=100cm
The perimeter of a square of side 5m = 5x4=20m
The perimeter of a square of side 50m = 50x4=200m
The perimeter of a square of side 1km = 1x4=4km
Perimeter of a Rectangle = length + width + length + width or 2 x l + 2 x w
Example: The perimeter of a rectangle whose length is 6cm and width is 4cm = 6 + 4 + 6 + 4 = 20 cm or 2 x 6 + 2 x 4= 12 + 8 = 20 cm
Find the perimeter of the following rectangles whose lengths and widths are given below:
Rectangle 1 - length is 8cm and width is 5cm
Perimeter = 2(8cm) + 2(5cm)= 26cm
Rectangle 2 - length is 10cm and width is 7cm
Perimeter = 2(10cm) + 2(7cm)= 34cm
Rectangle 3 - length is 8m and width is 6m
Perimeter = 2(8m) + 2(6m)= 26m
Rectangle 4 - length is 16m and width is 10m
Perimeter = 2(16m) + 2(10m) = 52m
Rectangle 5 - length is 4km and width is 2km
Perimeter = 2(4km) + 2(2km)= 12km
Evaluation: Today I learnt to how to write the answer in a Stage 5 way.
I’ve also learnt what the purpose of the Perimeter’s are for and how important they are.
