sin^2A+sin^2B=sin^2C求证△ABC的形状
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sin^2A+sin^2B=sin^2C求证△ABC的形状sin^2A+sin^2B=sin^2C求证△ABC的形状sin^2A+sin^2B=sin^2C求证△ABC的形状为直角三角形,利用正弦定理
sin^2A+sin^2B=sin^2C求证△ABC的形状
sin^2A+sin^2B=sin^2C求证△ABC的形状
sin^2A+sin^2B=sin^2C求证△ABC的形状
为直角三角形,利用正弦定理即可得到:
因为:
sinA/a=sinB/b=sinC/c
设上式等于t,则有:
sinA=at;
sinB=bt;
sinC=ct;
代入后得到:
a^2t^2+b^2t^2=c^2t^2
所以:
a^2+b^2=c^2.
故为直角三角形.
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