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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §1.5 A Review of Trigonometry, #9 · Trigonometry · Identities

Find the distance … from … to … and show on a…

Find the distance $d$ from $(1, 0)$ to $(\frac{1}{2}, 3 /2)$ and show on a circle why $6 d$ is less than $2 π$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §1.5 A Review of Trigonometry, #9

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