plz prove......... nn
Attachments:
Answers
Answered by
1
Explanation:
(4, -5)=x1y1
(1,1)=x2y2
(-2,7)=x3y3
=1/2 l x1(y2-y3)+x2(y3-y1)+x3(y1-y2)l
=1/2l4(1+7)+1(7+5)-2(-5-1)l
=1/2l4(8)+1(12)-2(-6)l
=1/2l32+12-12l
=1/2l32l
=1/2×32
=16
they are not collinear
Similar questions