Learning and Teaching Mathematics, 25, December 2018
- From the Editor. Duncan Samson
- When our intuition is challenged. Duncan Samson
- Tiling with a trilateral trapezium and Penrose tiles. Michael de Villiers
- Strategies for understanding subtraction. Tom Penlington
- Convergence with respect to triangle shapes - Elementary geometric iterations. Hans Humenberger & Franz Embacher
- The parallelogram identity. Letuku Moses Makobe
- Makhubo constructs a 45° angle. Ntaopane Joseph Makhubo & Brad Uy
- A diagonal property of a rhombus constructed from a rectangle. Michael de Villiers & James Metz
- Perpendicular lines: Four proofs of the negative reciprocal relationship. Harry Wiggins
- Right quadrilaterals. James Metz & Duncan Samson
- Exploring unit fractions. Alan Christison
- A geometric proof of Heron’s formula. Yiu-Kwong Man
- Proof without words. Moshe Stupel
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