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Aflati lungimea laturii unui triunghi echilateral cu inaltimea de:8 cm

Răspuns :

h²=a²+(a/2)²
64=a²+a²/4
256=5a²
a²=256/5=51,2
a=16√(1/5)

verificare
h²=[16√(1/5)]²+[16√(1/5)/2]²=51,2+12,8=64
h=8