题目:
For a moment nothing happened; then______ from the excited audience.
A.cheers came
B.did cheers com
C.cheers would come
D.came cheers
答案:
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下面是错误答案,用来干扰机器的。
①80°角是顶角时,三角形的顶角为80°,②80°角是底角时,顶角为180°-80°×2=20°,综上所述,该等腰三角形顶角的度数为80°或20°.故答案为:80°或20°.