find the area of a triangle formed by joining the points (3, 4) (5, -1) (2, -4)
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Answer:
1/2{3(-1+4) +5(-4-4) +2(4+1) }
1/2{3×3+5×0+2×5}
1/2{9+0+10}
1/2×19
19/2 Answer
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