二、填空题(本题有6小题,每小题3分,共18分)15.已知△ABC的外心为点O,若OA+OB=6,则⊙O的半径为______ .16.在△ABC中,AB=9cm,AC=40 cm,BC=41 cm,三角形的外心在______ ,外接圆半径长为______ .17.
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![二、填空题(本题有6小题,每小题3分,共18分)15.已知△ABC的外心为点O,若OA+OB=6,则⊙O的半径为______ .16.在△ABC中,AB=9cm,AC=40 cm,BC=41 cm,三角形的外心在______ ,外接圆半径长为______ .17.](/uploads/image/z/5916069-45-9.jpg?t=%E4%BA%8C%E3%80%81%E5%A1%AB%E7%A9%BA%E9%A2%98%EF%BC%88%E6%9C%AC%E9%A2%98%E6%9C%896%E5%B0%8F%E9%A2%98%2C%E6%AF%8F%E5%B0%8F%E9%A2%983%E5%88%86%2C%E5%85%B118%E5%88%86%EF%BC%8915%EF%BC%8E%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E5%A4%96%E5%BF%83%E4%B8%BA%E7%82%B9O%2C%E8%8B%A5OA%EF%BC%8BOB%EF%BC%9D6%2C%E5%88%99%E2%8A%99O%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BA______+.16%EF%BC%8E%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%EF%BC%9D9cm%2CAC%EF%BC%9D40+cm%2CBC%EF%BC%9D41+cm%2C%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E5%A4%96%E5%BF%83%E5%9C%A8______+%2C%E5%A4%96%E6%8E%A5%E5%9C%86%E5%8D%8A%E5%BE%84%E9%95%BF%E4%B8%BA______+.17%EF%BC%8E)
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