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Caption=1.Moving the point À, explore the value ~~  of the angle ÀÑÂ (BCD).~~2. Will the degree measure of the angle ÀÑÂ ~~   (BCD) change with different values of ~~   the radius of the circle?~~3. Prove the obtained result.
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Caption=1. Given a circle. Construct a chord ~~    of the given length. Create and save~~    a macros of this construction.~~2. Create and save a macros of the ~~    construction of a tangent to circle ~~    in the point of the circle.
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