Right Angled Triangle Calculator and Solver

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Eratosthenes made the observation that there was a location on Earth where, at the summer solstice, there was a time when the wells did not have a shadow at midday, which meant that the sun shined directly down onto them. Noting this, he placed a column of a known height at a known distance from that well and measured the size of the shadow at the same time of day and on the same day of the year in both locations.

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