Respuesta :

frika

Answer:

BC=7

Step-by-step explanation:

The circle can be circumscribed into the quadrilateral, if the sums of the opposite sides of the quadrilateral are eqaul.

Thus,

[tex]AB+CD=AD+BC,\\ \\8+BC=5+10,\\ \\BC=15-8=7.[/tex]

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