18 results
New characterisations of bicentric quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 106 / Issue 567 / November 2022
 Published online by Cambridge University Press:
 12 October 2022, pp. 414426
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 November 2022

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104.20 A characterisation of midsquare quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 104 / Issue 560 / July 2020
 Published online by Cambridge University Press:
 18 June 2020, pp. 331335
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 July 2020

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Eight formulae for the area of triangle OIH

 Journal:
 The Mathematical Gazette / Volume 103 / Issue 558 / November 2019
 Published online by Cambridge University Press:
 21 October 2019, pp. 471479
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 November 2019

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103.23 On Pitot’s theorem

 Journal:
 The Mathematical Gazette / Volume 103 / Issue 557 / July 2019
 Published online by Cambridge University Press:
 06 June 2019, pp. 333337
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 July 2019

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103.09 On the heights of a convex quadrilateral

 Journal:
 The Mathematical Gazette / Volume 103 / Issue 556 / March 2019
 Published online by Cambridge University Press:
 14 February 2019, pp. 145150
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 March 2019

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Area formulas for certain convex quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 103 / Issue 556 / March 2019
 Published online by Cambridge University Press:
 14 February 2019, pp. 2027
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 March 2019

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The importance of characterisations in geometry

 Journal:
 The Mathematical Gazette / Volume 102 / Issue 554 / July 2018
 Published online by Cambridge University Press:
 18 June 2018, pp. 302307
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 July 2018

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Metric relations in crossed trapezia

 Journal:
 The Mathematical Gazette / Volume 102 / Issue 554 / July 2018
 Published online by Cambridge University Press:
 18 June 2018, pp. 264269
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 July 2018

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101.38 Metric relations in crossed cyclic quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 101 / Issue 552 / November 2017
 Published online by Cambridge University Press:
 16 October 2017, pp. 499502
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 November 2017

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101.36 On the area of a tangential quadrilateral

 Journal:
 The Mathematical Gazette / Volume 101 / Issue 552 / November 2017
 Published online by Cambridge University Press:
 16 October 2017, pp. 495497
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 November 2017

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Further characterisations of tangential quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 101 / Issue 552 / November 2017
 Published online by Cambridge University Press:
 16 October 2017, pp. 401411
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 November 2017

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Properties of bisectdiagonal quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 101 / Issue 551 / July 2017
 Published online by Cambridge University Press:
 15 June 2017, pp. 214226
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 July 2017

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Generalisation of a quadrilateral duality theorem

 Journal:
 The Mathematical Gazette / Volume 101 / Issue 551 / July 2017
 Published online by Cambridge University Press:
 15 June 2017, pp. 208213
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 July 2017

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100.31 Heronlike formulas for quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 100 / Issue 549 / November 2016
 Published online by Cambridge University Press:
 17 October 2016, pp. 505508
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 November 2016

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100.30 Generalisations of the altitude theorem

 Journal:
 The Mathematical Gazette / Volume 100 / Issue 549 / November 2016
 Published online by Cambridge University Press:
 17 October 2016, pp. 501505
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 November 2016

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Properties of Pythagorean quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 100 / Issue 548 / July 2016
 Published online by Cambridge University Press:
 14 June 2016, pp. 213224
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 July 2016

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On the classification of convex quadrilaterals

 Journal:
 The Mathematical Gazette / Volume 100 / Issue 547 / March 2016
 Published online by Cambridge University Press:
 14 March 2016, pp. 6885
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 March 2016

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Minimal area of a bicentric quadrilateral

 Journal:
 The Mathematical Gazette / Volume 99 / Issue 545 / July 2015
 Published online by Cambridge University Press:
 10 July 2015, pp. 237242
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 July 2015

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