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[duonghieu]

Cho tu giac ABCD noi tiep(O).AB=a,BC=b,CD=c,DA=d.
CMR:a)AC²=$\frac{(ac+bd)(ad+bc)}{ad+cd}$.
b)BD²=$\frac{(ac+bd)(ab+cd)}{ad+bc}$

[L Lawliet]

Cho tu giac ABCD noi tiep(O).AB=a,BC=b,CD=c,DA=d.
CMR:a)AC²=$\frac{(ac+bd)(ad+bc)}{ad+cd}$.
b)BD²=$\frac{(ac+bd)(ab+cd)}{ad+bc}$

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