Question

aflati lungimea laturii unui triunghi echilateral stiind ca are aria egala cu : a)4 radical 3 cm la 2 b)1,265625 radical 3 cm la 2 c)30 cm la 2 help help

Answer 1

A=l^2rad3  /  4
a) 4rad3=16rad3  /  4 ⇒ l^2=16 ⇒ l=rad16 = 4 cm

b) l^2 = 4A/rad3 =4*1,265625 rad3 / rad3 
l= rad(4*1,265625)= 2*1,125=2,25 cm

c) l^2=4*900/rad3 ⇒ l = rad(4*900/rad3) ≈ 2*30 / rad1,73 ≈ 60/1,315 ≈ 45,63 cm.