Question

imi trebuie pana mâine la 16 vrggg​

Answer 1

$\small \: a)~~A_{ABC}=\frac{BC×AD}{2}=\frac{18×16}{2}=144~~cm²\\\\\\ b)~~ A_{ABC}=\frac{AC×d(B,AC)}{2}\\\\144=\frac{24×d(B,AC)}{2}\\\\144=12×d(B,AC)\\\\d(B,AC)=12~~cm$

Answer 2

$\it \mathcal{A}_{ABC}=\dfrac{BC\cdot AD}{2}=\dfrac{18\cdot16}{2}=18\cdot8=144\ cm^2\\ \\ \\ \mathcal{A}_{ABC}=\dfrac{AC\cdot d(B,\ AC)}{2} \Rightarrow144=\dfrac{24\cdot d(B,\ AC)}{2} \Rightarrow 144=12\cdot d(B,\ AC)\bigg|_{:12}\Rightarrow \\ \\ \\ \Rightarrow d(B,\ AC)=12\ cm$