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You will find several formulae in the Wikipedia article on "derivative".
Different figures have different formulae; here you will find formulae for the areas of some figures: http://en.wikipedia.org/wiki/Area#Formulae
Mainly, many magnitudes are related through different kinds of formulae. In advanced science you may have to derive your own formulae, but in more basic science, you just use existing formulae.Mainly, many magnitudes are related through different kinds of formulae. In advanced science you may have to derive your own formulae, but in more basic science, you just use existing formulae.Mainly, many magnitudes are related through different kinds of formulae. In advanced science you may have to derive your own formulae, but in more basic science, you just use existing formulae.Mainly, many magnitudes are related through different kinds of formulae. In advanced science you may have to derive your own formulae, but in more basic science, you just use existing formulae.
The answer will depend on the shape n question. There are different formulae for some simple shapes, more complicated formulae for complex shapes, and you probably have to estimate for really complicated shapes.The answer will depend on the shape n question. There are different formulae for some simple shapes, more complicated formulae for complex shapes, and you probably have to estimate for really complicated shapes.The answer will depend on the shape n question. There are different formulae for some simple shapes, more complicated formulae for complex shapes, and you probably have to estimate for really complicated shapes.The answer will depend on the shape n question. There are different formulae for some simple shapes, more complicated formulae for complex shapes, and you probably have to estimate for really complicated shapes.
There is no formula that covers all aspects of quadrilaterals. There are different formulae for its area, or its angles.There is no formula that covers all aspects of quadrilaterals. There are different formulae for its area, or its angles.There is no formula that covers all aspects of quadrilaterals. There are different formulae for its area, or its angles.There is no formula that covers all aspects of quadrilaterals. There are different formulae for its area, or its angles.