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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.1 Vectors and Dot Products, #36 · Multivariable Calculus · Vectors & geometry

If …, prove that … is perpendicular to

If $∣ A + B ∣^{2} = ∣ A ∣^{2} + ∣ B ∣^{2}$ , prove that $A$ is perpendicular to $B$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.1 Vectors and Dot Products, #36

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