find the area of an equilateral triangle whose vertices are A-3,0 B 0, 3 and C 0,3✓3
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1/2{X1(y2-y3)+X2(y3-y1)+X3(y1-y2)}
1/2{-3(3-3√3)+0(3√3-0)+0(0-3)}
1/2{√3}=0.866
1/2{-3(3-3√3)+0(3√3-0)+0(0-3)}
1/2{√3}=0.866
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