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a) A=(-2,4) B=(6,-1) C=(2,-1)
P=½|(xb-xa)(yc-ya)-(yb-ya)(xc-xa)|
P=½|(6-(-2))(-1-4)-(-1-4)(2-(-2))|
P=½|8*(-5)-(-5)(4)|
P=½|-40+20|=½|-20|=½*20=10
b) K=(-2,3) L=(-2,1) M=(0,0
P=½|(xl-xk)(ym-yk)-(yl-yk)(xm-xk)|
P=½|(-2+2)(0-3)-(1-3)(0+2)|
P=½|4|=2