Engineering Board Exam Reviewer · Area of Polygons by Coordinates · medium
Find the area of the triangle with vertices (-2,1), (4,3) and (1,-5).
- 42
- 21
- 18
- 24
Answer
B. 21
Solution
Shoelace: xiyi+1=-6-20+1=-25 and yixi+1=4+3+10=17. Area= 12|-25-17|=21.
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