MediumVectors & geometry

Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.1 Vectors and Dot Products, #24 · Multivariable Calculus · Vectors & geometry

Draw the triangle … in Example 1 (the four-sided figure in space)

Draw the triangle $P QR$ in Example 1 (the four-sided figure in
space). By geometry not vectors, show that $P R$ is twice as long as $V$ . Similarly $∣ P R ∣ = 2∣ W ∣$ . Also $V$ is parallel to $W$ because
both are parallel to ______. So $V = W$ as before.

This exercise builds on another exercise in its source book, which isn't shown here.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.1 Vectors and Dot Products, #24

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