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Line BD is tangent to a circle with diameter AB. Can some please explain this because I'm very confused...

 May 8, 2020
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A point of tangent forms a 90o angle with the radius or diameter to that point.

An inscribed angle's measure is 1/2 of the arc it intercepts  BCA intercepts an arc of 180o   so BCA is 90o  too.

 May 8, 2020

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