[tex]1) \ \text{Formula inaltimii in triunghiul dreptunghic} : \boxed{i=\frac{c_1 \times c_2}{ip}} \\ i= \frac{20\times15}{25} \\ i= \frac{300}{25} \\ i=12\ cm \\ \\ 2) \text {Teorema lui Pitagora in triunghiul dreptunghic isoscel } : \\ \boxed {ip^2=2c^2} \\ 4^2=2c^2 \\ 16=2c^2 \\ c^2=16:2 \\ c^2=8 \\ c= \sqrt{8} \\ c=2 \sqrt{2} \\ \\ \text {Aria triunghiului dreptunghic isoscel} : \boxed{\frac{c^2}{2}} \\ A= \frac{(2\sqrt{2})^2 }{2} \\ A= \frac{8}{2} \\ A=4 cm^2 [/tex]
