If a is the center of the circle which of these is our a radii

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$8

step-by-step explanation:

it is pretty much backwards.

you take the 4x2 multiply that, and that is = $8

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)