PERIMETERS What is the Perimeter of a shape. What is the Perimeter of this rectangle? What is the Perimeter of this rectangle? 5cm 15cm.

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Presentation transcript:

PERIMETERS What is the Perimeter of a shape

What is the Perimeter of this rectangle? What is the Perimeter of this rectangle? 5cm 15cm

Possible Methods Length + Width + Length + Width = 40cm Two Lengths + Two Widths (2 x 15)+(2 x 5) = 40cm Two Lots of: Length + Width 2 (15 + 5) = 40cm Length + Length + Width + Width = 40cm

The Problem using Algebra X cm Y cm Work out the PERIMETER of this rectangle with width of X cm and length of Y cm?

Possible Methods Length + Width + Length + Width Y + X + Y + X Two Lengths + Two Widths (2 x Y)+(2 x X) Two Lots of: Length + Width 2 (Y + X) Length + Length + Width + Width Y + Y + X + X

Formula for Perimeter of a Rectangle Perimeter = 2 (Length + Width)

Challenge Question: Work out the Perimeter of this shape. 70cm 20cm 10cm 40cm 30cm