helppppppppppppppppp :(

We can draw the quadrilateral (tetragon) around a circle if and only if the sum of the lengths of opposite sides are equal.

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AB + CD = AD + BC

20 + 14 = AD + 11 ----> AD = 23

helppppppppppppppppp :(

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~~~~~~~~

AB + CD = AD + BC

20 + 14 = AD + 11 ----> AD = 23

## Comments

is it 12?