Question

La un paralelipiped dreptunghic l=60 m L=80 cm si diagonala=260 cm
Cum aflu inaltimea ? 

Answer 1

diag= radical mare din l^2+L^2+h^2
260= radical mare din60^2+80^2+h^2 / ()^2
67600=3600+6400+h^2
h^2=57600
h= radical din 57600
h=240

Answer 2

$d^2=L^2+l^2+h^2$

$260^2=60^2+80^2+h^2$

$h^2=260^2-100^2=(260-100)(260+100)=160\cdot360=16\cdot36\cdot100$

$h=\sqrt{16\cdot36\cdot10}=4\cdot6\cdot10=240\ m$