Depends
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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'.
Shape of a T
A 'T' shape could be called a cross, and in a religious manner, a crucifix.
Symmetry is when something has exactly the same shape on either side of an axis line. T is a vertical symmetrical shape.