Question

find out the area of triangle formed by joining the points (4,0)(0,0)(0,4).

Answer 1

area=1/2*b*h
area=1/2*4*4
area=8

Answer 2

let A=(x1,y1)=(4,0). ,B=(0,0)=(x2,y2). ,
C=(0,4)=(x3,y3).
area of∆=1/2[x1(y2-y3)+x2(y3-y1)+x3(y1-y2).
1/2[4(0-4)+0(4-0)+0(0-0).
1/2[-16]
-8 (:.we know that area can not be negative so
area;
8 sq.unit