Question

Repede va rog mult de tot imi trebuie urgent dau coroana ex 2

Answer 1

$\it \mathcal{A}= \dfrac{BC\cdot AD}{2}=\dfrac{15\cdot7,2}{2}=15\cdot3,6= 54\ cm^2\\ \\ \\ \mathcal{A}=\dfrac{c_1\cdot c_2}{2}\Rightarrow \mathcal{A}=\dfrac{AB\cdot AC}{2} \Rightarrow 54=\dfrac{9\cdot AC}{2}|_{\cdot2}\Rightarrow 108=9\cdot AC|_{:9} \Rightarrow\\ \\\Rightarrow AC=12\ cm$