Identify the vertices of this quadrilateral.
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AB =2 units Ans
AD =4 units Ans
BC=1 units Ans
draw a straight line from C upto E.
a right angled triangle CED formed.
In triangle CED,
ED=AD-AE
ED =4 units -1 units=3 units
CE=AB=2 units
CD²=CE²+ED²
CD²=2²+3²
CD²=4+9
CD=\|13 units Ans
note\| is root over.
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