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设内接正方形边长从大到小依次为x1,x2,……,设对应的三角形面积依次为A1,A2,……
S1+S2+...=½S△ABC,则A1+A2+...=½S△ABC
S1+S2+...=x1²+x2²+...=½S△ABC=½·½·a·a/tanA=a²/(4tanA)
A1+A2+...+An=½·x1²·tanA+½·x2²·tanA+...+½·xn²·tanA
=½tanA(x1²+x2²+...)
=½tanA·a²/(4tanA)
=a²/8
=½S△ABC
=a²/(4tanA)
tanA=2
A=arctan2
S1+S2+...=½S△ABC,则A1+A2+...=½S△ABC
S1+S2+...=x1²+x2²+...=½S△ABC=½·½·a·a/tanA=a²/(4tanA)
A1+A2+...+An=½·x1²·tanA+½·x2²·tanA+...+½·xn²·tanA
=½tanA(x1²+x2²+...)
=½tanA·a²/(4tanA)
=a²/8
=½S△ABC
=a²/(4tanA)
tanA=2
A=arctan2
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