Properties of TriangleHard

Question

The values of a, for which the points A, B, C with position vectors and respectively are the vertices of a right-angled triangle with C = are

Options

A.2 and 1
B.-2 and -1
C.-2 and 1
D.2 and -1

Solution

⇒    


⇒ (2 - a) (1 - a) = 0
⇒ a = 2, 1.

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