Euclid's Elements Book 3 - Proposition 18
A line touching a circle makes a right angle with the radius

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Euclid's Elements Book 3 - Proposition 19

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Euclid's Elements Book 3 - Proposition 16

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Euclid's Elements Book 1: Proposition 21

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Euclid's Elements Book 3 - Proposition 20

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Rowan Atkinson's Funniest Moments That Prove He's a Comedy Genius

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Euclid's Elements Book 3 - Proposition 17

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Euclid's Elements Book 1: Proposition 16, Exterior Angles For A Triangle

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Euclid's Elements - Book 8, Proposition 18

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