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chord from an angle

作者：Arthur Lee
主題：幾何
[size=100][size=150]If angle A is [math]90^\circ[/math], BC should be a diameter. How about the other figures? Will BC be the same as the radius?[/size][/size]
If angle A is , BC should be a diameter. How about the other figures? Will BC be the same as the radius?

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