Cosmos


COSMOS - The SAO Encyclopedia of Astronomy › A

Area

  • The term 'area' is a quantity giving the size of a two-dimensional region or shape within a given enclosed border.

    The formulae for the area $ A $ of common shapes are:

    shapeformulanote
    square$ A = a^2 $where $ a $ is the length of one of the sides
    rectangle$ A = ab $where $ a $ is the base and $ b $ is the height
    circle$ A $ = $ \pi r^2 $where $ r $ is the radius
    triangle$ A = 0.5ab $where $ a $ is the base and $ b $ is the height

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