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In the figure above, what is the perimeter of △PQR?
(1)The length of segment PT is 2
(2)The length of segment RS is √33
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问三角形PQR的周长等于多少？
条件一：PT=QT=2，在直角三角形QTR中，根据tan30度和cos30度，可以求出QR和TR的长度
在等腰直角三角形QTR中，根据勾股定理可以求出QP的长度，现在所有的边长都集齐了，可以打妖怪了，可以求出整个PQR的周长了。充分。
条件二：只知道RS等于根号33，但没有说QS=SR，没办法判断QS的长度，也没说PT的长度，很多都未知，你叫我怎么求PQR的周长？没办法求出来，看多几眼也没办法求出来，别浪费时间想了。就是不充分。
339092noyc
角QST的角度未知 不要想当然是60度
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2020-10-03 14:26:48
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数据充分DS
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难题300
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数据充分DS -17976
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数据充分DS -17975
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数据充分DS -17974
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