The number of diagonals in a polygon of n sides is given by n(n-3)/2 Hence in an octagon (number of sides = 8) is given by 8(8-3)/2=20.
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Even small oysters can produce reasonably large pearls, although the older and larger the shell, the great the chance of finding a good-sized pearl.
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Odisha has been a State rich (of) history and culture.
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