Question

Intr-un ∆ o inaltime este de 5cm si aria de 15cm². aflati lungimea corespunzatoare inaltimii date.

Un ∆ dreptunghic are aria 24cm² si lungimea inaltimii de 4,8cm. Aflati lung ipotenuzei si produsul lungimilor celor 2 catete.

Care este aria unui ∆ dreptunghic isoscel de cateta a?  

Va rog ajutati-ma. Repede va rog

Answer 1

$a) \ A= \frac{b*h}{2} \\A=15\\ \frac{b*h}{2} =15\\ \frac{b*5}{2}=15\\b*5=2*15\\b= \frac{2*15}{5}\\b=2*3=6 \\ \\ \ b)A= \frac{b*h}{2}\\A=24\\ \frac{b*h}{2}=24\\ \frac{b*4,8}{2}=24\\ b*4,8=2*24\\b= \frac{2*24}{4,8}\\b=2*5=10\\b=h\\ \\ A= \frac{c_{1}*c_{2}}{2}\\ \frac{c_{1}*c_{2}}{2}=24\\c_{1}*c_{2}=2*24\\c_{1}*c_{2}=48$