Find the area of a triangle whose vertices are a(-2,-3), b(3,2) and c(-1,-8)
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51
1/2(-2(2+8)+3(-8+3)-1(-3-2)
1/2(-20-15+5)
1/2(-30)
15
1/2(-20-15+5)
1/2(-30)
15
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22
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