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Find the area of the triangle having vertices p(1, 3), q(−1, 1), r(−3, 2).
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Find the area of the triangle having vertices p(1, 3), q(−1, 1), r(−3, 2).

User Ilia Maskov
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See, pls, the offered decision, which consists of 2 ways: way1 based on vectors, way2 based on planimetry.
Find the area of the triangle having vertices p(1, 3), q(−1, 1), r(−3, 2).-example-1
User Nathanial
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