# In quadrilateral ABCD, AB and DC are parallel, AD and BC are parallel. Find the perimeter of triangle COD if point O is the intersection of diagonals and AC = 20, BD = 20, AB = 13. How do I solve this?

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Feb 25, 2018

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Perimeter =

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From the information given we can identify what type of quadrilateral we are given.

The opposite sides are given as parallel, so

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The diagonals of a rectangle bisect each other, they share the same midpoint,

The sides of

The lengths of all these sides known so we can find the perimeter:

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