Question

find the area of triangle formed by the point P(2,1)Q(6,1)and R(2,4).

Answer 1

use the formulae of area of triangle given in the book it can be easily solved

Answer 2

area of triangle = 1/2(x1(y2-y3)+x2(y3-y1)+x3(y1-y2))

=1/2(2 (1-4) + 6(4-1) + 2(1-1) )
=1/2(-6 + 18 )
=1/2( -12)
= -6
ignore the sign Answer is 6 square units