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Shadows can help measure Earth’s circumference! 🌍 2,200 years ago, Greek mathematician Eratosthenes used this clever method. By measuring shadow lengths in two cities 794 km apart and applying simple math to relate the angle to the circle’s circumference, he calculated Earth’s size with remarkable accuracy—nearly matching today’s value! It’s a great example of how math isn’t just numbers—it helps us explore, understand, and measure the world around us in incredible ways! — Learn Math the Right
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