三角形 ABC 满足 AB = 16 cm,BC = 63 cm,AC = 65 cm。 点 A、B 和 C 是否位于同一个圆的圆周上?请写出过程并解释。 答 ... ...
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完整解法
11
1. Identify the longest side and test using Pythagoras' theorem
The longest side is cm.
2. Conclude that the triangle is right-angled
Since
triangle is right-angled at .
3. Use the right angle to justify that the three points lie on a circle
A right angle is formed in a semicircle, so can be the diameter of the circle and lies on its circumference.
Therefore, , and lie on the circumference of a circle.
答案
Yes. Since , triangle is right-angled at . Hence , and lie on the circumference of a circle with as diameter.
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