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Use the law of cosines to prove that isometries preserve angles; that is suppose that T : R2 → R2 is an isometry and let P, Q
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Snpo e TR R2.snw isovnotu , ,しet pra , R eR malu a deiangl, apQR Law of Cosings 2 n ,22 と2-a2.tbl_da basC → Cose= altb-c2 aa-|pl-. Qリ2.t.jal_Rリ의Pl_Rリ2 h

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Use the law of cosines to prove that isometries preserve angles; that is suppose that T : R2 → R2 is an isometry and let P, Q, R E R2 be three noncollinear points in the plane. Denote the images...
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