MediumVectors & geometry

Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.1 Vectors and Dot Products, #20 · Multivariable Calculus · Vectors & geometry

If … and … choose … so the angle … is

If $P = (0, 0)$ and $R = (0, 1)$ choose $Q$ so the angle $P QR$ is $9 0^{\circ}$ . All possible $Q$ 's lie in a ______.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.1 Vectors and Dot Products, #20

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