Notes
105.29 A geometric memory
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- 21 June 2021, pp. 318-323
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105.15 Could Newton have calculated the deflection angle of starlight?
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- 17 February 2021, pp. 154-158
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Correspondence
Correspondence
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- 13 October 2021, p. 549
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Teaching Notes
A small note on small angle approximations
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- 17 February 2021, pp. 159-161
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Notes
105.30 A Cinderella theorem in circle geometry
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- 21 June 2021, pp. 323-327
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Teaching Notes
diverges while converges
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- 17 February 2021, pp. 161-162
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Notes
105.31 On the Brocard disc
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- 21 June 2021, pp. 327-328
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Feedback
On ‘On the frequency of Friday the thirteenth’
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On 105.16
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Other
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- 17 February 2021, pp. 163-168
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Notes
105.32 The side-angle duality in geometry: a direct proof of sufficiency of a cyclic quadrilateral theorem
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- 21 June 2021, pp. 329-331
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On 105.17 and 105.18
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Problem Corner
Problem Corner
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- 17 February 2021, pp. 169-174
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Notes
105.33 A property of bifocal conics, illuminated by Ptolemy’s theorem
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- 21 June 2021, pp. 331-332
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On 105.19
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Notes
105.34 The difference between k-gonal numbers with (2n − 1) sides and (n − 1) sides is (3k − 4)-gonal
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- 21 June 2021, pp. 333-334
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Student Problems
Student Problems
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- 17 February 2021, pp. 175-177
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Reviews
Math makers by Alfred S. Posamentier and Christian Spreizer, pp. 448, $25, ISBN 978-1-63388-520-2, Prometheus Books (2019)
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- 17 February 2021, p. 178
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Notes
105.35 Reconciling remainders in Maclaurin expansions
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- 21 June 2021, pp. 334-338
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On 105.23
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