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Mathematics, 15.03.2020 18:54 preciosakassidy

What is the perimeter, in cm, of quadrilateral ABCD if Line AB is perpendicular to Line BC, Line DC is perpendicular to Line BC, AB=9 cm, DC=4 cm, and BC=12 cm?
Please help, I don't know how to solve this, an explanation would be helpful too, Thank you.

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