- Choice A
$$ Base =AC = 4-(-2)=6 $$
$$ Height = Distance\ from\ B\ to\ AC = 2-(-1)=3 $$
$$ \therefore Area\ of\ \triangle ABC=\frac{Base\times Height}{2}=\frac{6\times 3}{2}=9 $$
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$$ Base =AC = 4-(-2)=6 $$
$$ Height = Distance\ from\ B\ to\ AC = 2-(-1)=3 $$
$$ \therefore Area\ of\ \triangle ABC=\frac{Base\times Height}{2}=\frac{6\times 3}{2}=9 $$
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