Plot the points P (-1, 1) , Q (2, 3),and R(8, 11) show that they are colinear.
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given poins=p (-1,1) q (2,3) r (8,11)
area of triangle = 1\2 |[x1 (y2-y3)+x2 (y3-y1)+x3 (y1-y2)|
=1/2|-1 (3-11)+2 (11-1)+8 (1-3)|
= 1/2|-3+11+22-2+8-24|
=1/2|12|
=1/2×12
=6
area of triangle = 1\2 |[x1 (y2-y3)+x2 (y3-y1)+x3 (y1-y2)|
=1/2|-1 (3-11)+2 (11-1)+8 (1-3)|
= 1/2|-3+11+22-2+8-24|
=1/2|12|
=1/2×12
=6
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