3-1三角形的內角與外角--1
三角形的內角與外角
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1. △ABC中,∠A:∠B:∠C等於下列何式時,可表示△ABC為直角三角形?
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2.
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3. 下列何者可以是等腰三角形的一組外角?
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4. 已知△ABC中,∠A=(3x-10)°、∠B=(2x+20)°、∠C=(x-10)°,則此三角形為何種三角形?
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5. 若△ABC的兩外角和為270°,則△ABC是哪一種三角形?
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6. 一等腰三角形頂角的度數等於一底角度數的2倍,那麼此底角為________度。
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7.
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8.
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9.
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10. 承上題:小郁由P點出發,經過A點、Q點、C點、B點再回到P點,則小郁一共轉了________度。
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