By adding the length of all the sides.
You can find the permeter if you know the length of the sides. You need to add the lengths of all the sides together.
4*5=20 20 cm
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it depends on the triangle.if it is a "pure" triangle (symetrical on all sides) then the permeter is 9
area is the amount inside the object and permeter is the amount outside of it. To find area you do length times width. To find perimeter you add all the sides together.
An odometer.
64cm2
The River Thames does not have a delta.
You can find Delta in the BB Base
Look on one of the main rivers - or find the town Delta on a map!