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r=10
r=1/2 a
a=2*10=20
P=a²
P=20²
P=400 [j²]
2.
R=2
R=2/3 h
h=3*2/2
h=3
h=a√3/2
a=2h/√3
a=2√3h/3
a=2*3√3/3
a=2√3