GT: `\DeltaABC` vuông
`AB=6cm;AC=8cm`
Đường cao `AH`
`\text{__________________}`
KL: `a;\DeltaABC`$\backsim$`\DeltaHBA`
GT | \(AB=6\left(cm\right);AC=8\left(cm\right)\\ \Delta ABC\perp A\) Đường cao `AH` |
KL | \(\Delta ABC\sim\Delta HBA\) |
Vì \(\left\{{}\begin{matrix}\widehat{BAC}=\widehat{BHA}=90^0\\\widehat{ABC}\text{ chung}\end{matrix}\right.\to\Delta ABC\sim\Delta HBA\left(g.g\right)\)