Euclid's Elements: Book 1, Prop 42
A step by step board presentation of Book 1, Proposition 42: "To construct, in a given rectilineal angle, a parallelogram equal to a given triangle."

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Euclid's Elements: Book 1, Prop 43

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Euclid's Elements Book 1: Proposition 42, Constructing a Parallelogram

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Euclid's Elements: Book 1, Prop 41

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Euclid's Elements: Book 1, Prop 46

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Euclid's Elements — Book I, Proposition 32

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SOH CAH TOA Explained Simply

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1986: How to Spot the Upper Class | That's Life! | BBC Archive

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Euclid's Elements: Book 3, Prop 35

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