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You partition the compound shape into simpler shapes whose areas you can work out using formulae, and then add all those parts together.
There is no formula as such. You partition the compound shape into simpler shapes whose areas you can work out using formulae, and then add all those parts together.
You would find the area of the inside and outside shape (pretending that the inside shape was not in the outside shape). then, you would take the area of the outside shape and subtract the area of the inside shape.
In the phrase 'area of a shape', both area and shape are nouns. In your mind, add 'the', it helps to show that they are nouns: 'the area of the shape'.
compound leaves