Let and be three points in space

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

Let P(1,2,3), Q(3,−1,4)P(1,2,3),\ Q(3,-1,4) and R(2,0,−1)R(2,0,-1) be three points in space. The area of △PQR\triangle PQR equals: (a) 139\sqrt{139} (b) 278\sqrt{278} (c) 12278\dfrac{1}{2}\sqrt{278} (d) 12294\dfrac{1}{2}\sqrt{294}

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