Parallelism is transitive, starring Lennart | Euclid's Elements Book 1 Prop 30

Lennart decided to pay us a visit midway through the video and I'm not going to re-record

Element page: https://mathcs.clarku.edu/~djoyce/java/elements/bookI/propI30.html

B01P27: https://mathcs.clarku.edu/~djoyce/java/elements/bookI/propI27.html
B01P29: https://mathcs.clarku.edu/~djoyce/java/elements/bookI/propI29.html

B01CN1: https://mathcs.clarku.edu/~djoyce/java/elements/bookI/cn.html

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Euclid Elements website: https://mathcs.clarku.edu/~djoyce/java/elements/

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