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x-direction = i
y-direction = j
z-direction = k
A(1,0,0) ,B(0,1,0), C(0,0,1)
AC = OC-OA =-i+k
AB = OB-OA= -i+j
AC xAB = ( -i+k) x(-i+j) ( x: cross product )
= -k - j -i
=-i-j -k
法向量 =( -1,-1, -1)
平面方程
[(x-1)i + (y-0)j + (z-0)k].(-i-j-k)=0
-(x-1)-y-z =0
x+y+z=1
y-direction = j
z-direction = k
A(1,0,0) ,B(0,1,0), C(0,0,1)
AC = OC-OA =-i+k
AB = OB-OA= -i+j
AC xAB = ( -i+k) x(-i+j) ( x: cross product )
= -k - j -i
=-i-j -k
法向量 =( -1,-1, -1)
平面方程
[(x-1)i + (y-0)j + (z-0)k].(-i-j-k)=0
-(x-1)-y-z =0
x+y+z=1
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