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Question
Find the area of triangles whose vertices are P(3, 6), Q(−1, 3), R(2, −1)
Solution
Here, P(x1, y1) ≡ P(3, 6), Q(x2, y2) ≡ Q(−1, 3), R(x3, y3) ≡ R(2, −1)
Area of triangle = `1/2|(x_1, y_1, 1),(x_2, y_2, 1),(x_3, y_3, 1)|`
∴ A(ΔPQR) = `1/2|(3, 6, 1),(-1, 3, 1),(2, -1, 1)|`
= `1/2[3(3 + 1) - 6(-1 - 2) + 1(1 - 6)]`
= `1/2[3(4) - 6(- 3) + 1( - 5)]`
= `1/2(12 + 18 - 5)`
∴ A(ΔPQR) = `25/2` sq. units
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