Respostas

2014-05-20T15:04:35-03:00
A=(2,1,1)
B=(3,-1,0)
C=(4,2,-2)

AB=raiz((3-2)²+(1--1)²+(1-0)²) = raiz(1+4+1) = raiz(6)
AC=raiz((4-2)²+(2-1)²)+(1+2)²) = raiz(4+1+9)= raiz(14)
BC=raiz(((4-3)²+(2+1)²+(2-0)²) = raiz(1+9+4)= raiz(14)
(Hc)² =(raiz(14))²- (V6* 2)²= 14-6/4 =14-6/4 = 50/4
Hc=(5V2)/2 <================

S=1/2*5V2/2*V6=5V3/2<===============