![]() Written mathematically, the ratio of AB / BE = AC / CD. In Figure B, the two triangles ABE and ACD are similar (their angles are congruent), so by definition, the ratio of the length of the sides AB and AC to the ratio of the length of the bases BE and CD is identical. Its secret lay in the rules of geometry, specifically, in the simple fact that similar triangles have similar length ratios between their various sides. For the next 500 years, the sector was one of the most commonly used mathematical instruments in Western civilization. ![]() Galileo made quite a bit of money by writing and selling a book that explained how to use a sector as an arithmetical tool. Almost immediately after it was invented, Galileo realized that this new gizmo was an extremely useful instrument, and he started teaching others how it worked. In any event, it was certainly Galileo who made the sector popular. Usually, the credit for its invention goes to the great 15th-century Italian scientist Galileo Galilei, although some historians of science give invention credit to Englishman Thomas Hood, a Galileo contemporary. Subscribe today to get more great projects delivered to your mailbox. Showcasing amazing maker projects of 2022 Gift the gift of Make: Magazine this holiday season! Subscribe to the premier DIY magazine todayĬommunity access, print, and digital Magazine, and more Share a cool tool or product with the community.įind a special something for the makers in your life. Skill builder, project tutorials, and more Get hands-on with kits, books, and more from the Maker Shed
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