Question

Find the area of a triangle whose vertices are given as(1,-1)(-4,6)and(-3,-5)

Answer 1

mod|1 -1 1|

|-4 6 1|

|-3 -5 1|

=1(6+5)+1(-4+3)+1(20+18)

=11-1+38

=48 sq m

hope this will help

happy learning ^_^