Consider the points below. $$P(0, -2, 0), Q(6, 1,-2), R(2, 4, 1)$$ Find the area of the triangle PQR.
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2Done! What else do you want me to do? – José Carlos Santos Nov 13 '22 at 15:16
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You do have in particular $$A=\frac12\det\begin{vmatrix}a_1&a_2&1\b_1&b_2&1\c_1&c_2&1\end{vmatrix}$$ – Piquito Nov 13 '22 at 15:25
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you can use cross product and divide by 2 the area – Sine of the Time Nov 13 '22 at 16:32