Respuesta :

Banabanana
The measure of an angle formed by a two secants drawn from a point outside the circle is half the the difference of the intercepted arcs, so:

[tex]\cfrac{85^o - arcBD}{2}=20^o \\ \\ 85^o-arcBD = 40^o \\ \\ arcBD = 85^o - 40^o = 45^o[/tex]

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