Question

Ex 12 , doar punctele b si c

Answer 1

$\it \dfrac{AC\cdot BD}{2}=\dfrac{48\cdot36}{2}$

$\it Fie\ BF=d(B,\ CD)\Rightarrow BF\perp CD\\ \\ \mathcal{A}_{ABCD}=CD\cdot BF \Rightarrow 864=30\cdot BF \Rightarrow BF = \dfrac{\ 864^{(3}}{30}=\dfrac{288}{10}=28,8\ cm$