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Why does length x width work for finding area?
That is the definition of the area of a rectangle. It does not work for any other shape.
In maths what is the area of a composite shape?
You need to break the shape up into different shapes. For example if you have a shape that is basically a triangle and a square merged together you will work out the squares area then the triangles area and add them together.
What is the area of a composite shape if the base is 4 and the height is 2?
All you have given is a rectangle which I presume encloses the composite shape. It is impossible to give the area of the composite shape other than to say it is less than or equal to 8 sq units. To work out the area of a composite shape, split it up into areas which you can work out (eg squares and rectangles) and sum the area of all the area.
How do you solve area for symmetric figures?
It depends on the symmetry. Work out the area of half the shape by filling the shape with squares and triangles of known areas and times the answer by two.
What is the total area of a shape?
depends which shape - they all have different formulas to work out their area. eg. area of a triangle is 1/2base x height or 1/2ab x sin(c)
