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因為,ab = 5, ac = 2√5, bc = √5, 所以,ac^2+ bc^2 =20+5=25,ab^2=5^2=25 所以,ac^2+ bc^2 =ab^2, 三角形abc是直角三角形, 所以三角形abc的面積=ac·bc=2√5·√5=2×5=10
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