Răspuns:
Explicație pas cu pas:
A triunghi echilateral = l^2*√3/4
l^2 = 4A/√3
a)
l^2 = 4*25√3/√3 = 100
l = √100 = 10 cm
A = l*h/2
h = 2A/l = 2*25√3/10 = 5√3 cm
b)
l^2 = 4*48√3/√3 = 192
l = √192 = 8√3 cm
h = 2*48√3/8√3 = 12 cm
c)
l^2 = 4*225√3/2√3 = 450
l = √450 = 15√2 cm
h = 2*225√3/2*15√2 = 15√3/√2 = 15√6/2 cm
d)
l^2 = 4*27√3/√3 = 108
l = √108 = 6√3 cm
h = 2*27√3/6√3 = 9 cm